A psychologist would like to determine whether there is a
relation between depression and aging. It is known that the general
population averages μ = 40 on a standardized depression
test. The psychologist obtains a sample of n = 9
individuals who are all more than 70 years old. The depression
scores for this sample are as follows.
50, 47, 41, 49, 44, 42, 43, 47, 48
On the basis of this sample, can the psychologist conclude that
depression for...