In which of the following situations should an a priori contrast be used?
A) A t-test is used to conclude that men consume more hamburgers than women
B) A chi-square test is used to conclude that there is a difference in type of living quarters by class status
C) Using a one-way ANOVA, significant differences in ad recall are found between three experimental groups and one control group
D) A Z test indicates that the national average of the number of soft drinks consumed in the US exceeds that of France
E) All of the above can use an a priori contrast

Question

Quizplus · Accepted Answer

An a priori contrast should be used in a situation where there are specific hypotheses and comparisons of interest, such as comparing two specific groups or levels. In the given situation, a one-way ANOVA is being used to test for differences among multiple experimental groups, and an a priori contrast would be used to compare specific pairs of groups that were defined beforehand. This approach helps to avoid the problem of multiple comparisons and can increase the power of the analysis. The other options may not necessarily require an a priori contrast, as they may not involve specific comparisons of interest beforehand.

In Which of the Following Situations Should an a Priori