15.12

a. Although the samples are actually related, an investigator ignores this fact in the statistical analysis and uses a t test for two independent samples. How will this mistake affect the probability of a type II error?

b. Using S_D = (SS_D) / n-1Compare the difference between t-test for two independent samples and t-test for two related samples.

c. You are encouraged to try the data set in 15.7 in two different ways: two independent samples and two related samples. What do you find in those results? You need to focus on p-values and discuss how it will affect type II error?