STATISTICS

1. A research methods student conducts a study on the relationship between people’s level of extroversion and the number of close friends they have. She computes Pearson’s r, which comes out to be – 1.70. Which of the following is most clearly true? 

a. The relationship between the two variables is weak. 

b. More extroverted people have fewer friends. 

c. She ought to use a bar graph to display her results. 

d. She made an error in computing Pearson’s r. 

2. When you want to show that Variable X has a direct effect on Variable Y, what is the best kind of study to conduct? 

a. a nonexperimental study 

b. an experiment 

c. an observational study 

d. a survey 

3. The relationship between people’s heights and weights is positive.

a. True 

b. False

4. In a negative relationship, higher scores on one variable are associated with lower scores on another variable. 

a. True 

b. False