One sample of n = 8 scores has a variance of s2= 6 and a second sample of n = 8 scores has a variance of s2 = 10 . If the pooled variance is computed for these two samples, then the value obtained will be ______
a. closer to 6 than to 10
b. closer to 10 than to 6
c. exactly halfway between 6 and 10
d. cannot be determined without more information
C
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Regression toward the mean occurs when
a. people's expectations lead them to experience some change, even though they receive a fake or ineffective treatment. b. people who originally score extremely high or low on some trait are measured a second time, and their new score falls closer to the average. c. people recover from a mental or physical illness without any form of intervention. d. people who originally score near the average on some trait are measured a second time, and their new score falls at the extreme high or low end of the scale.
A chi-square test for independence is being used to evaluate the relationship between two variables, one of which is classified into 3 categories and the second of which is classified into 4 categories. What is the df value for the chi-square statistic?
a. 6 c. 10 b. 7 d. 11
If Hamid wants to do one study to determine whether or not playing violent video games causes children to act more aggressively, he would be best served by doing a(n) a. experiment
b. correlational study. c. longitudinal study. d. cross-sectional study.
Genetic influence on obesity can cause some adolescents to be a. more influenced by television ads b. less able to convert fat to fuel
c. far thinner than their parents. d. estrogen deficient.