A school psychologist is using a depression inventory—on which a score of 0 indicates no depression and a score of 10 indicates severe depression—to see if the level of depression in fourth graders in a particular class of 20 students differs from that of fourth graders in general at a school. The results of previous testing indicate that fourth graders at the school usually have a score of 5 on the scale, but the variation is unknown. The current sample of 20 fifth graders has a mean depression score of 4.4.
-The psychologist tests the null hypothesis that the level of depression of fourth graders in this class does not differ from fourth graders in general at the school and obtains a t score of -0.20.The decision regarding the null hypothesis would be to
A)reject it.
B)fail to reject it.
C)adjust the power.
D)increase the sample size.

Question

Quizplus · Accepted Answer

Since the t score obtained is not statistically significant, we fail to reject the null hypothesis. Therefore, there is no evidence to suggest that the level of depression in fourth graders in this class differs from that of fourth graders in general at the school.

A School Psychologist Is Using a Depression Inventory—on Which a Score