1. The independent t-test is based on which distribution?

a) The distribution of difference scores

b) The distribution of sample means

c) The distribution of error scores

d) The distribution of z

2. What is the probability of type II error when the null hypothesis is rejected?

a) 0.5

b) 0.05

c) 0.025

d) 0

3. The test statistic follows the formula of difference divided by variability.

a) True

b) False

4. Type I errors may occur with ______ results and type II errors with ______ results.

a) Statistically significant, statistically significant

b) Statistically significant, statistically non-significant

c) Statistically non-significant, statistically significant

d) Statistically non-significant, statistically non-significant

5. How does variability in the distribution of sample means compare to variability in a population based on individual scores?

a) Samples tend to vary less than individual scores.

b) Samples exaggerate differences among scores.

c) Individual scores tend to be more stable over time than samples.

d) Sample means vary less than individual scores.