5 For the following situations indicate which type of hypoth

5. For the following situations, indicate which type of hypothesis test would be used. a. Children who have poor social skills are selected to participate in social skills training. The researcher observes the children on the playground both before and after the social skills training. For each of the 35 children, she records the number of positive peer interactions. She then analyzes the mean before-after difference. ______ one-sample t-test ______ two independent samples t-test ______ matched pairs t-test ______ pooled two sample t-test b. A researcher randomly assigns 80 high school seniors to either an experimental group where they learn about time management or to a control group where they discuss current events. The researcher then gathers information, for all students, on homework completion. The researcher wants to find out if the time management session is effective for improving homework completion among high school seniors. ______ one-sample t-test ______ two independent samples t-test ______ matched pairs t-test ______ pooled two sample t-test c. A researcher want to know if chocolate affects your memory. The researcher find 40 pairs of twins, and randomly selects one twin to eat chocolate and the other twin does not each chocolate. Then all 80 people are given a memory test. The researcher records the score for each person. ______ one-sample t-test ______ two independent samples t-test ______ matched pairs t-test ___ pooled two sample t-test d. A researcher reads that the average time that adults in the United States spend watching TV is 28 hours per week. The researcher randomly selects a sample of 40 college students. The researcher wants to from out if the students also watch TV an average of 28 hours per week. ______ one-sample t-test ______ two independent samples t-test ______ matched pairs t-test ______ pooled two sample t-test e. College women who are being treated for depression at the campus counseling center were examined for initial depression and then assigned to a drug treatment condition or a placebo control condition. It is assumed the standard deviation is not affected by the drug. At the end of the treatment period, the women take a depression test and their test scores are analyzed to determine if the drug is helpful. ______ one-sample t-test ______ two independent samples t-test ______ matched pairs t-test ______ pooled two sample t-test

Solution

a)

matched pairs t test

b)

2 independent samples t test

c)

matched pairs t test

d)

one sample t test

e)

pooled 2 sample t test