Author Question: After gathering the data for an experiment with a one factor between groups design, if we were to ... (Read 24 times)

dejastew · **on:** Jun 19, 2018

After gathering the data for an experiment with a one factor between groups design, if we were to conduct several t tests instead of an ANOVA, the probability of _____ would be unacceptably high.

a. a Type I error c. null results
b. a Type II error d. both a and b

Question 2

In a one factor between groups design, if we want to know whether the difference between group means was produced by chance, we should analyze the data by conducting _____.

a. an analysis of variance
b. separate t tests for each pair of means
c. either a or b
d. none of these - we can tell by looking at the results on a bar graph

SVictor · **Reply #1 on:** Jun 19, 2018

Answer to Question 1

A
Such a procedure would increase the probability of a Type I error by alpha for each comparison made. The result is that the experiment wise probability of a Type I error would be way too high.

Answer to Question 2

A
Separate t tests would raise the probability of a Type I error to an unacceptable level.