EPPP Questions Research and Statistics

R squared is the: a. coefficient of multiple determination b. coefficient of stability c. coefficient of internal consistency d. silver character on "Star Wars" - answer-a. coefficient of multiple determination When data points are widely scattered around a regression line, this indicates: a. low homoscedasticity b. low correlation coefficient c. low heteroscedasticity d. high heteroscedasticity - answer-b. low correlation coefficient Heteroscedasticity - answer-The scatter is uneven (unequal) at different points on the regression line. For example, there might be high variability around the regression line at low X (predictor) values and low variability around the line at high X values. It is different amounts of scatter, but not high scatter A psychologist in a hospital is conducting research designed to assess the effects of a new drug on the social behavior of psychotic patients. Which of the following would be the best way to decrease experimenter bias in this type of study? a. randomized block design b. a Solomon four-group design c. counterbalancing d. a double-blind study - answer-d. a double blind study Which of the following is a measure of "amount of variability accounted for"? a. Cohen's d b. F-ratio c. alpha d. eta squared - answer-d. eta squared Alpha - answer-Level of significance set by a researcher prior to analyzing data Cohen's d - answer-Used as an index of effect size, but it is a measure of the mean difference between two groups. F-ratio - answer-Statistic calculated when using the analysis of variance The eta coefficient would be used to a. estimate the strength of a nonlinear relationship between two continuous variables b. estimate the strength of the relationship between two rank-ordered variables c. estimate the strength of the relationship between two dichotomous variables d. estimate the strength of the relationship between a dichotomous variable and a continuous variable - answer-a. estimate the strength of a nonlinear relationship between two continuous variables. The most common correlation coefficient - answer-Pearson r Pearson r - answer-Used to measure the relationship between two continuous variables that are related in a linear way Note: eta is used when there is a nonlinear relationship Phi Coefficient - answer-Can be used to measure the correlation between two dichotomous variables (i.e, variables that can take one of two values) Point-Bisceral Correlation - answer-Used to measure the correlation between a dichotomous variable and a continuous variable. Spearmena's rho - answer-Used to measure the correlation between two sets of ranked data You have conducted a study to assess the relationship between salary and job performance