Student Affairs wants to compare the answers of seniors and freshmen to the same metric-scaled question. How would a researcher state the relevant hypothesis?
a. No difference exists between the means of all paired groups.
b. A difference does exist between the means of two classes.
c. The mean of the senior class is less than or equal to the mean of the freshman class.
d. No difference exists between means of the two classes.
e. The mean of the senior class is greater than the mean of the freshman class.
Answer: d. No difference exists between means of the two classes.