1Marks: 1
For this problem and other problems on this exam, please use the binomial distribution that is displayed in slide 3 of second Power Point under Topic 4: Probability Theory (i.e., Class Eleven).
What is the probability of receiving only 0 or 1 heads in 5 coin flips? (The answer must be written as a number carried tofourdecimal places. Write the final answer only; do not write the formula or computations used to derive the answer. Do not write the answer as a percentage.)
Answer:Question2Marks: 1
For this problem and other problems on this exam, please use the binomial distribution that is displayed in slide 3 of second Power Point under Topic 4: Probability Theory (i.e., Class Eleven).
Which of the following best describes the shape of this distribution?
Choose one answer.
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a.flat |
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b.negatively skewed |
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c.symmetrical |
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d.positively skewed |
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Question3Marks: 1
For this problem and other problems on this exam answer questions based on this intercorrelational matrix.
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Variable 1
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Variable 2
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Variable 3
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Variable 1
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Variable 2
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-.18
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Variable 3
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-.30
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.27
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Variable 4
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-.74*
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.60*
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.34
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Note: * = p
Which of the following describe the relationship between variables 2 and 4?
Choose one answer.
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a.there is no trend – a positive z score for one variable is as likely to be paired with a positive or negative z score for the other variable |
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b.positive z scores for one variable tend to be paired with positive z scores for another variable |
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c.negative z scores for one variable tend to be paired with positive z scores for the other variable |
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d.none of these answers are correct |
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Question4Marks: 1
For this problem and other problems in this quiz, use the following test scores from a previous class of mine to answer the question. Regard these data as asamplewhen computing the answers for each question in the quiz:
12, 17, 16, 16, 21, 18
What is the mean for these data? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question5Marks: 1Which of the following is true of the critical value in hypothesis testing?Choose one answer.
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a.the probability associated with the test statistic is > alpha or > .05 when the test statistic falls beyond the critical value |
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b.the area under the normal curve that falls between critical values = .95 |
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c.retain null if test statistic exceeds the critical value |
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d.reject null if test statistic is less than the critical value |
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Question6Marks: 1
For this problem and other problems in this quiz, use the following test scores from a previous class of mine to answer the question. Regard these data as asamplewhen computing the answers for each question in the quiz:
12, 17, 16, 16, 21, 18
What is the median for these data? (The answer must be written as a number carried toonedecimal place. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question7Marks: 1
For this problem and other problems in this quiz, use the following test scores from a previous class of mine to answer the question. Regard these data as asamplewhen computing the answers for each question in the quiz:
12, 17, 16, 16, 21, 18
What is the standard deviation for these data? (This answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question8Marks: 1If researchers found p Choose one answer.
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a.random effects are too likely to rule out |
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b.the null hypothesis was retained |
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c.if the experiment was conducted 100 times, we would expect to find non-significant findings quite often |
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d.test statistic fell in the region of rejection |
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Question9Marks: 1
For this problem and other problems on this exam consider the following study. Mueser, et al. (2008) were interested in the effects of psychological treatment on emotional distress of adults suffering from both PTSD and other serious mental illnesses. They assigned one group of adults to a cognitive behavioral therapy (CBT) and one group to receiving existing treatments readily available in the community (TAU - treatment as usual). At the end of therapy they asked participants to complete a measure of the severity of their PTSD symptoms. They expected that participants in the CBT group would have lower mean scores on the severity of PTSD symptoms measure than the TAU group.
Meuser, K.T., et al., (2008). A randomized controlled trial of cognitive-behavioral treatment for posttraumatic stress disorder in severe mental illness.Journal of Consulting and Clinical Psychology, 76(2), 259-271.
Which of the following would be the null hypothesis for this study?
Choose one answer.
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a.mean of the groups are equal in the population |
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b.mean of the TAU group > mean of the CBT groups |
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c.cannot be determined from the information provided |
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d.correlation of CBT with serious mental illness is zero in the population |
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Question10Marks: 1
For this problem and other problems on this exam consider the following study. Mueser, et al. (2008) were interested in the effects of psychological treatment on emotional distress of adults suffering from both PTSD and other serious mental illnesses. They assigned one group of adults to a cognitive behavioral therapy (CBT) and one group to existing treatments readily available in the community (TAU - treatment as usual). At the end of therapy they asked participants to complete a measure of the severity of their PTSD symptoms. They expected that participants in the CBT group would have lower mean scores on the severity of PTSD symptoms measure than the TAU group.
Meuser, K.T., et al., (2008). A randomized controlled trial of cognitive-behavioral treatment for posttraumatic stress disorder in severe mental illness.Journal of Consulting and Clinical Psychology, 76(2), 259-271.
Which of the following is the operational definition of the dependent variable(s) in this study?
Choose one answer.
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a.serious mental illness |
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b.age |
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c.scores on the PTSD measure |
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d.type of treatment someone received |
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Question11Marks: 1
For this problem and other problems on this exam consider the following study. Mueser, et al. (2008) were interested in the effects of psychological treatment on emotional distress of adults suffering from both PTSD and other serious mental illnesses. They assigned one group of adults to a cognitive behavioral therapy (CBT) and one group to receiving existing treatments readily available in the community (TAU - treatment as usual). At the end of therapy they asked participants to complete a measure of the severity of their PTSD symptoms. They expected that participants in the CBT group would have lower mean scores on the severity of PTSD symptoms measure than the TAU group.
Meuser, K.T., et al., (2008). A randomized controlled trial of cognitive-behavioral treatment for posttraumatic stress disorder in severe mental illness.Journal of Consulting and Clinical Psychology, 76(2), 259-271.
How many levels were there for the independent variable(s) in this study?
Choose one answer.
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a.> three |
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b.three |
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c.one |
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d.two |
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Question12Marks: 1
For this problem and other problems on this exam answer questions based on this intercorrelational matrix.
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Variable 1
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Variable 2
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Variable 3
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Variable 1
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Variable 2
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-.18
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Variable 3
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-.30
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.27
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Variable 4
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-.74*
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.60*
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.34
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Note: * = p
The null hypothesis of no correlation in the population was rejected for which of the following relationships?
Choose one answer.
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a.variables 1 and 2 |
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b.variables 2 and 3 |
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c.variables 3 and 4 |
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d.variables 1 and 4 |
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Question13Marks: 1
For this problem and other problems on this exam, please use the binomial distribution that is displayed in slide 3 of second Power Point under Topic 4: Probability Theory (i.e., Class Eleven).
The probability of receiving 0 or 1 heads in 5 coin flips would be considered an unusual event in psychology.
Answer:TrueFalseQuestion14Marks: 1Which of the following describe a scale on which 0 = low anxiety, 1 = mid anxiety, and 2 = high anxiety.Choose one answer.
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a.interval |
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b.ratio |
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c.ordinal |
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d.nominal |
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Question15Marks: 1
For this problem and other problems on this exam answer questions based on this intercorrelational matrix.
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Variable 1
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Variable 2
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Variable 3
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Variable 1
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Variable 2
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-.18
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Variable 3
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-.30
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.27
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Variable 4
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-.74*
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.60*
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.34
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Note: * = p
What is the proportion of variance in variable 1 that is predicted by variable 3? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer. Do not write the answer as a percentage.)
Answer:Question16Marks: 1
For this problems and other problems on this exam, please use the following situation: Researchers obtained a normally shaped distribution of scores in which mean = 60 and variance = 25.
What is the probability of obtaining a score = 58 or greater? (This answer must be written as a number carried tofourdecimal places. Write the final answer only; do not write the formula or computations used to derive the answer. Do not convert the answer to a percentage.)
Answer:Question17Marks: 1Imagine that income is normally distributed (a little hard to do, but let’s just it is for this problem) for members of our major political parties. Let’s say the mean for Republicans is 90 (all units in thousands) with a standard deviation of 12, and the mean for Democrats is 70 with a standard deviation of 10. What is the probability that a Democrat drawn at random will score above the income associated with the 10
thPercentile Rank for Republicans? (The answer must be written as a number carried to
fourdecimal places. Only write the final answer; do not write the formula or computations used to derive the answer. Do not convert the answer to a percentage.)Answer:Question18Marks: 1
For this problem and other problems on this exam, please use the binomial distribution that is displayed in slide 3 of second Power Point under Topic 4: Probability Theory (i.e., Class Eleven).
Which of the following describes this type of distribution?
Choose one answer.
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a.stem and leaf |
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b.probability |
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c.bar |
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d.frequency |
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Question19Marks: 1
For this problem and other problems on this exam, please use the binomial distribution that is displayed in slide 3 of second Power Point under Topic 4: Probability Theory (i.e., Class Eleven).
What is the probability of receiving 3 heads out of 5 coin flips? (The answer must be written as a number carried tofourdecimal places. Write the final answer only; do not write the formula or computations used to derive the answer. Do not write the answer as a percentage.)
Answer:Question20Marks: 1
For this problem and other problems in this quiz, use the following test scores from a previous class of mine to answer the question. Regard these data as asamplewhen computing the answers for each question in the quiz:
12, 17, 16, 16, 21, 18
For the score, 12, how many standard deviations units does this score fall above or below the mean?
Choose one answer.
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a.-1.65 |
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b.-1.96 |
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c..67 |
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d.-1.59 |
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Question21Marks: 1Imagine that researchers found a significant negative correlation between income and mental distress. However, later researchers consistently found no correlation between these variables. Which of the following explains the discrepancy in findings?Choose one answer.
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a.Type I error |
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b.power increased |
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c.confidence interval |
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d.Type II error |
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Question22Marks: 1
For this problem and other problems on this exam, refer to the following situation: a screening test for new employees is normally distributed with a mean = 45 and a standard deviation = 3.
In many situations researchers want to know the cut-off scores between which 95% of test takers will fall and 5% of test takers will fall above or below. For this problem, what is thelowerof the two cut-off scores? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question23Marks: 1
For this problem and other problems on this exam answer questions based on this intercorrelational matrix.
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Variable 1
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Variable 2
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Variable 3
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Variable 1
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Variable 2
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-.18
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Variable 3
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-.30
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.27
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Variable 4
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-.74*
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.60*
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.34
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Note: * = p
The strength of the relationship is strongest between which two variables?
Choose one answer.
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a.variables 3 and 4 |
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b.variables 1 and 3 |
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c.variables 1 and 4 |
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d.variables 2 and 4 |
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Question24Marks: 1
For this problem and other problems on this exam consider the following study. Mueser, et al. (2008) were interested in the effects of psychological treatment on emotional distress of adults suffering from both PTSD and other serious mental illnesses. They assigned one group of adults to a cognitive behavioral therapy (CBT) and one group to receiving existing treatments readily available in the community (TAU - treatment as usual). At the end of therapy they asked participants to complete a measure of the severity of their PTSD symptoms. They expected that participants in the CBT group would have lower mean scores on the severity of PTSD symptoms measure than the TAU group.
Meuser, K.T., et al., (2008). A randomized controlled trial of cognitive-behavioral treatment for posttraumatic stress disorder in severe mental illness.Journal of Consulting and Clinical Psychology, 76(2), 259-271.
If the researchers were concerned there was low power in this study, which of the following would help to increase power?
Choose one answer.
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a.increase β (probability of making a Type II error) |
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b.decrease α (probability of making a Type I error) |
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c.increase 1 - α (confidence of a test) |
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d.increase N |
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Question25Marks: 1
For this problem and other problems on this exam answer questions based on this intercorrelational matrix.
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Variable 1
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Variable 2
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Variable 3
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Variable 1
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Variable 2
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-.18
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Variable 3
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-.30
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.27
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Variable 4
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-.74*
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.60*
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.34
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Note: * = p
What is the proportion of the variance in variable 2 that is not predicted by variable 4? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer. Do not write the answer as a percentage.)
Answer:Question26Marks: 1
For this problem and other problems on this exam, please use the following situation: Researchers obtained a normally shaped distribution of scores in which mean = 60 and variance = 25.
What is the Percentile Rank associated with a score = 63? (This answer must be written as a number carried to two decimal places. Write the final answer only, and do not include a percentage symbol or a reference to PR in the answer.)
Answer:Question27Marks: 1
For this problem and other problems on this exam, refer to the following situation: a screening test for new employees is normally distributed with a mean = 45 and a standard deviation = 3.
In many situations researchers want to know the cut-off scores between which 95% of test takers will fall and 5% of test takers will fall above or below. For this problem, what is thehigherof the two cut-off scores? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question28Marks: 1
For this problem and other problems in this quiz, use the following test scores from a previous class of mine to answer the question. Regard these data as asamplewhen computing the answers for each question in the quiz:
12, 17, 16, 16, 21, 18
What is the variance for these data? (The answer must be written as a number carried to two decimal places. Write the final answer only; do not write the formula or computations used to derive the answer.)
Answer:Question29Marks: 1
For this problem and other problems on this exam consider the following study. Mueser, et al. (2008) were interested in the effects of psychological treatment on emotional distress of adults suffering from both PTSD and other serious mental illnesses. They assigned one group of adults to a cognitive behavioral therapy (CBT) and one group to receiving existing treatments readily available in the community (TAU - treatment as usual). At the end of therapy they asked participants to complete a measure of the severity of their PTSD symptoms. They expected that participants in the CBT group would have lower mean scores on the severity of PTSD symptoms measure than the TAU group.
Meuser, K.T., et al., (2008). A randomized controlled trial of cognitive-behavioral treatment for posttraumatic stress disorder in severe mental illness.Journal of Consulting and Clinical Psychology, 76(2), 259-271.
Which of the following is true about the independent variable(s), in this study?
Choose one answer.
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a.one IV (PTSD) |
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b.two IVs (PTSD and age) |
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c.one IV (type of treatment) |
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d.three IVs (type of treatment, PTSD, and serious mental illness) |
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Question30Marks: 1Researchers concluded that mean differences were attributable to systematic processes rather than random factors or sampling error. Which of the following findings would lead the researchers to reach this conclusion?Choose one answer.
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a.the probability of obtaining the test statistic if the null hypothesis was true was quite high |
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b.t test statistic > t critical value |
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c.z
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d.F = 2.15, p > .05 |
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Question31Marks: 1
For this problem and other problems on this exam, refer to the following situation: a screening test for new employees is normally distributed with a mean = 45 and a standard deviation = 3.
What is the percentile rank associated with a score of 49? (The answer must be written as a number carried totwodecimal places. Write the final answer only; do not write the formula or computation used to derive the final answer. Do not use a percentage symbol or refer to PR in your answer.)
Answer:Question32Marks: 1For this problem and other problems on this exam, refer to the following situation: a screening test for new employees is normally distributed with a mean = 45 and a standard deviation = 3.
What is the probability that a participant will receive a score or 47 or greater? (The answer must be written as a number carried to
fourdecimals. Write the final answer only; do not write the formula or computations used to derive the answer. Do not write the answer as a percentage.)Answer: