10 of 11 10 of 11 10 of 11 Below are the questions you need to answer. There are 51 questions. 1. Explain how the distribution of means is different from the distribution of population. 2. Why is the...

multiple choice question assignment


10 of 11 10 of 11 10 of 11 Below are the questions you need to answer. There are 51 questions. 1. Explain how the distribution of means is different from the distribution of population. 2. Why is the distribution of means needed for a z-test? Questions 3 and 4. Use the following information. Population mean = 100 Population variance = 40 Sample size = 10 3. What is the mean of the distribution of means? a. 4 b. 10 c. 40 d. 100 4. What is the standard deviation of the distribution or mean? a. 2 b. 4 c. 40 d. 100 Questions 5 and 6. Use the following information. Population mean = 100 Population variance = 30 Sample size = 10 5. What is the mean of the distribution of means? a. 3 b. 10 c. 30 d. 100 6. What is the standard deviation of the distribution or mean? a. 1.73 b. 1.83 c. 3 d. 3.33 Questions 7 and 8. Use the following information. Population mean = 100 Population variance = 20 Sample size = 10 7. What is the mean of the distribution of means? a. 2 b. 10 c. 20 d. 100 8. What is the standard deviation of the distribution or mean? a. 1.41 b. 1.49 c. 2 d. 2.22 Questions 9 and 10. Use the following information. Population mean = 100 Population variance = 10 Sample size = 10 9. What is the mean of the distribution of means? a. 1 b. 10 c. 100 d. 1,000 10. What is the standard deviation of the distribution or mean? a. 1 b. 10 c. 100 d. 1,000 Questions 11 and 12. Use the following information. Population mean = 50 Population variance = 10 Sample size = 10 11. What is the mean of the distribution of means? a. 1 b. 5 c. 10 d. 50 12. What is the standard deviation of the distribution or mean? a. 1 b. 10 c. 50 d. 100 Questions 13 and 14. Use the following information. Population mean = 100 Population variance = 40 Sample size = 20 13. What is the mean of the distribution of means? a. 2 b. 5 c. 40 d. 100 14. What is the standard deviation of the distribution or mean? a. 1.41 b. 1.45 c. 2.10 d. 2.11 Questions 15 and 16. Use the following information. Population mean = 100 Population variance = 10 Sample size = 20 15. What is the mean of the distribution of means? a. 0.5 b. 0.71 c. 10 d. 100 16. What is the standard deviation of the distribution or mean? a. 0.5 b. 0.71 c. 10 d. 100 Questions 17-29. A researcher is interested in whether people are better able to identify emotions correctly when they are extremely tired compared to when they are not tired. The accuracy ratings of people in the general population (those who are not extremely tired) are normally distributed with a mean of 82 and a variance of 20. The researcher arranges to test 50 people who had no sleep the previous night. The mean accuracy for these 50 individuals was 78. Use the .05 level. 17. What is the null hypothesis? a. Those who are tired and those who are not tired will have the same accuracy ratings. b. Those who are tired will have higher ratings than those who are not tired. c. Those who are tired will have lower ratings than those who are not tired. d. Those who are tired will have different ratings than those who are not tired. 18. What is the research hypothesis? a. Those who are tired and those who are not tired will have the same accuracy ratings. b. Those who are tired will have higher ratings than those who are not tired. c. Those who are tired will have lower ratings than those who are not tired. d. Those who are tired will have different ratings than those who are not tired. 19. What is the comparison mean? a. 20 b. 50 c. 78 d. 82 20. What is the comparison standard deviation? a. 0.40 b. 0.63 c. 20 d. 82 21. How do you know the answer to Questions 19 and 20? Be sure to address both the comparison mean and the comparison standard deviation. 22. Upload your work for the hand calculations from Question 20. Please ensure that this is ready to upload before you begin the quiz because you only get one attempt for this assignment. See pages 6-7 on the syllabus for options for doing this. 23. What is/are the cutoff(s)? a. +1.64 b. ±1.96 c. +2.33 d. ±2.58 24. What is the z-score for the sample score? a. -0.20 b. –6.35 c. -10 d. 78 25. Upload your work for the hand calculations from Question 24. Please ensure that this is ready to upload before you begin the quiz because you only get one attempt for this assignment. See pages 6-7 on the syllabus for options for doing this. 26. How is finding the z-score for a z-test different from finding a z-score for an individual? 27. Upload a sketch for this hypothesis test showing: a) the cutoff(s) b) the rejection region(s) c) the sample z-score Please ensure that this ready to upload before you begin the quiz because you only get one attempt for this assignment. See pages 6-7 on the syllabus for options for doing this. 28. What is your conclusion for this hypothesis test? a. reject the null b. accept the research hypothesis c. accept the null d. fail to reject the null 29. Provide an interpretation of your findings for this hypothesis test. An interpretation is a one sentence conclusion of the hypothesis test that should be free of statistical jargon. Questions 30-40. A psychologist is interested in the number of dreams per month that people have in which they are alone in their dream. It is known that in the general population the number of such dreams over one month follows a normal curve with µ = 5 and σ = 4. The researchers want to test the prediction that the number of such dreams will be greater among people who have recently experiences a traumatic event. The psychologist studied 36 individuals who have recently experienced a traumatic event. Their mean number of alone dreams is 8. Use the .05 level. 30. What is the null hypothesis? a. Those who have had a traumatic experience will have more alone dreams as those who have not had a traumatic experience. b. Those who have had a traumatic experience will have just as many alone dreams as those who have not had a traumatic experience. c. Those who have had a traumatic experience will have a different number of alone dreams as those who have not had a traumatic experience. d. Those who have had a traumatic experience will have fewer alone dreams as those who have not had a traumatic experience. 31. What is the research hypothesis? a. Those who have had a traumatic experience will have more alone dreams as those who have not had a traumatic experience. b. Those who have had a traumatic experience will have just as many alone dreams as those who have not had a traumatic experience. c. Those who have had a traumatic experience will have a different number of alone dreams as those who have not had a traumatic experience. d. Those who have had a traumatic experience will have fewer alone dreams as those who have not had a traumatic experience. 32. What is the comparison mean? a. 4 b. 5 c. 8 d. 36 33. What is the comparison standard deviation? a. 0.11 b. 0.33 c. 0.44 d. 0.67 34. Upload your work for the hand calculations from Question 33. Please ensure that this is ready to upload before you begin the quiz because you only get one attempt for this assignment. See pages 6-7 on the syllabus for options for doing this. 35. What is/are the cutoff(s)? a. +1.64 b. ±1.96 c. +2.33