Name: ____________________________________________________________
1. Descriptors of a distribution are reliable when data sets are small in size.
A. True
B. False
2. Which of the following could most be considered an ordinal variable?
A. Height in feet
B. Body Mass Index (BMI)
C. Educational level
D. Annual income
3. Data in a row in a data table corresponds to which of the following?
A. an observation
B. a variable
C. a value
D. all of the above
E. none of the above
4. If the mean is larger than the median, the distribution is:
A. Negatively skewed
B. Neutrally skewed
C. No serious effect on the distribution
D. None of the above
5. A probability density functions (pdf) is a mathematical relation that assigns probabilities to all possible outcomes for a continuous random variable.
A. True
B. False
6. A population has a Normal distribution score with
µ=120, and
σ = 20. Based on 68-95-99.7 rule, we can say that 68% of the scores lie within which range?
A. 120-140
B. 120-150
C. 100-140
D. 80-100
7. Which of the following meets the conditions for equipoise?
A. a genuine void in knowledge between the exposure and the outcome variables
B. doubt about benefits and risks must be in perfect balance before the trial is begun
C. genuine knowledge about the association between the exposure and the outcome variables
D. A and B
E. A and D
8
. Which of the following concerning ordinal variables is false?
A. Ordinal variables rank observations into groups
B. Ordinal variables may not have a uniform distance in groups
C. Ordinal variables quantify differences between groups
D. Ordinal variables categorize by rank order
9. The description of a distribution is summarized only by its center.
A. True
B. False
10. According to the law of probability, the proportion gradually closes in on the true probability as n decreases.
A. True
B. False