1. If a researcher determined that df = 12 and chose the level of confidence to be 95%, what would be the critical value for a two independent samples t test?

Select one:

a. 2.201

b. 1.812

c. 1.796

d. 2.179

2. A between groups design is a research design in which ____ participants are observed____ in each group or at each level of one factor.

a. the same; at one point in time

b. the same; at least twice

c. different; at one point in time

d. different; at least twice

3. If a researcher determined that df = 15 and chose the level of confidence to be 95%, what would be the critical value for a two independent samples t test?

Select one:

a. 2.145

b. 1.753

c. 2.131

d. 1.761

4. What is the fourth assumption for a two independent sample t test?

a. We assume that the probabilities of each measured out come in a study are independent.

b. We assume that the data we measure we obtained from a sample that was selected using a random sampling process.

c. We assume that data in a population being sampled are normally distributed.

d. We assume that the variance in each population is equal to each other.