8. Psychologists at a college want to know if students are sleeping more or less than the recommended average of 8 hours a day. Which of the following code choices correctly tests the null hypothesis?...

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Extracted text: 8. Psychologists at a college want to know if students are sleeping more or less than the recommended average of 8 hours a day. Which of the following code choices correctly tests the null hypothesis? proc univariate data=statdata.sleep mu0<>8; var hours; a. run; proc univariate data-statdatasleep; var hours / mu0=8; b. run; proc univariate data=statdata.sleep; var hours / mu0<>8; C. run; proc univariate data=statdata.sleep mu0=8; var hours; d. run;