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PS370 Research Methods in Psychology Online Exam 7 Answers (Ashworth College)

posttest-only,

posttest-only, control-group design because the: A. former adds an additional control group. B. latter employs randomization only at the time of the posttest. C. former adds a pretreatment measurement of the independent variable. D. former adds a pretreatment measurement of the dependent variable. Question 4 of 40 2.5/ 2.5 Points History, maturation, and regression to the mean can be controlled by including proper: A. control groups. B. experimental groups. C. factorials. D. instrumentation. Question 5 of 40 0.0/ 2.5 Points The most important method for decreasing the error term is to: A. decrease the sample size. B. hold the independent variable constant. C. increase the number of dependent variables. D. increase sample size. Question 6 of 40 0.0/ 2.5 Points If the p-value for an F-test is less than the alpha level chosen in the experimental design phase, you should __________ significant difference between groups. A. reject the null hypothesis and conclude that there is a B. reject the null hypothesis and conclude that there is no C. accept the null hypothesis and conclude that there is a D. accept the null hypothesis and conclude that there is no Question 7 of 40 0.0/ 2.5 Points The chief disadvantage of the t-test is that it: A. evaluates only the variance and not the means. B. is difficult to apply. C. can only be used when there are three or more groups. D. can only compare two groups at a time. Question 8 of 40 2.5/ 2.5 Points In order to support the hypothesis that the independent variable has influenced the dependent variable, __________ is necessary. A. a significantly high within-groups variation B. careful reduction of all variation

C. a significantly high between-groups variation D. a sample size of at least 30 Question 9 of 40 0.0/ 2.5 Points In order for us to study causal relationships among variables, it is necessary for: A. the independent variable to demonstrate variation. B. the dependent variable to be a constant. C. the independent variable to demonstrate that it is randomly distributed. D. there to be extraneous variation. Question 10 of 40 0.0/ 2.5 Points A researcher wants to look at the effects of "stress endurance treatment" on self-esteem in cancer patients. The researcher has 50 cancer patients attend "stress endurance treatment" sessions once a week. At the end of the 8-week treatment, participants are measured on self-esteem. This is an example of a(n) __________ design. A. ex post facto B. ad hoc C. single-group, posttest-only D. longitudinal Question 11 of 40 2.5/ 2.5 Points Statistical tests CANNOT tell us whether: A. the combination of experimental and extraneous variance is large enough to differentiate the groups. B. there is a significant difference between groups. C. there is a reliable difference between groups. D. the observed difference is due to experimental or extraneous variables. Question 12 of 40 0.0/ 2.5 Points The ANOVA procedure depends on calculations of: A. the size of the difference between the means of the two groups. B. both the variability within-groups and the variability between-groups. C. levels of the independent variable. D. preliminary t-tests. Question 13 of 40 2.5/ 2.5 Points In experiments, we hope to find A. between-groups variance. B. a reduction in sampling error. C. within-groups variance. D. an increase in sampling error. Question 14 of 40 2.5/ 2.5 Points

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