Question: Researchers are interested in whether there is a difference between the number of brothers and number of sisters for graduate students. So they randomly selected

Researchers are interested in whether there is a difference between the number of brothers and number of sisters for graduate students. So they randomly selected 20 graduate students and asked each student the number of brothers and number of sisters s/he has. What test do you recommend to address the research question? a. independent-samples t-test b. paired-samples t-test c. one-mean z-test d. one-mean t-test

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