For Each of the Following Situations, Indicate Whether an Independent-Samples

For each of the following situations, indicate whether an independent-samples analysis or a matchedpairs analysis would be appropriate. (Do not bother to explain.)
a. You want to investigate whether cows milked by a mechanical device tend to produce more or less milk than cows milked by hand. You have 20 cows to work with, so you randomly assign half of them to be milked by machine and half by hand.
b. You want to investigate whether there is a difference in the average age or cars driven by students and faculty at your university, so you randomly select 30 students and 10 faculty members and ask them to report the age of the cars that they drive.
c. You want to investigate whether college freshmen tend to gain 15 pounds of weight, as the "freshman fifteen" legend suggests. You recruit 40 freshmen to participate in your study. You weigh them at the beginning of the fall term and again at the end of the fall term.

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a. This is an independent-samples design...

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