Question

1. When do we use an independent groups t-test? a. b. c. d. When we are comparing means from one sample that has been measured twice. When we are comparing means from two different samples. When we are comparing a sample mean to a population mean. When we are comparing two population means. 2. Which of the following is true regarding the use of t-tests for true experiments versus quasi-experimental designs? a. b. We use the same t-test whether it is a true experiment or a quasi-experimental design. We cannot use t-tests for quasi-experimental designs because there is no random assignment to groups and we must therefore use nonparametric statistics. When using t-tests for nonexperimental designs we must make a correction for the degrees of freedom. Quasi-experimental designs require the use of a one-sample t-test. C. d. 3. Which of the following are the assumptions for an independent groups 7-test? Write the letters for all that apply (one point each). a. b. C. d. interval/ratio level data ordinal level data data is normally distributed data is not normally distributed observations are independent observations are correlated or related homogeneity of variance heterogeneity of variance e. 1. h

Answer 1

1. b

2. b

3. a, c, e, g

4. d