A researcher hypothesizes that freshmen, sophomores, juniors, and seniors are represented equally among students who volunteer as research participants. The researcher intends to test this hypothesis by selecting a sample of N = 40 research volunteers. For the chi-square test, the expected frequency for freshman is: O 10 O 20 O 40 O None of the above.

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A: It is given that the total number of volunteers is 40.

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