Author Question: The university counseling center has treated a large number of students for depression. They find ... (Read 46 times)

genevieve1028 · **on:** Jun 20, 2018

The university counseling center has treated a large number of students for depression. They find that the standard deviation of depression scores for their pool of students is substantially higher after treatment than before treatment. The most likely explanation is

a. some students improved more than others.
b. some students improved substantially while others actually got worse.
c. depression therapy at the counseling center affects different students differently.
d. all of the above

Question 2

As you increase the number of observations in a sample from 50 to 500, you are most likely to

a. leave the mean and standard deviation approximately unchanged.
b. increase the variability as the sample size increases.
c. decrease the variability as the sample size increases.
d. make the shape of the distribution more skewed.