Which of the following might one do in order to increase the power of a z test?
a. Increase the sample size.
b. Use a two-tailed test.
c. Decrease sample size.
d. None of the above.
Question 2
A researcher is interested in whether high school students who play sports have a higher or lower body mass index (BMI) than students in the general population. The researcher is unsure whether playing sports will decrease body mass (due to more calories burned) or increase body mass (due to more muscle mass). He compares their average body mass index to that of students in the general population and finds that zobt = +1.92 . This is a _____ test and the researcher should conclude _____.
a. one-tailed; that students who are athletes have significantly higher BMIs
b. two-tailed; that students who are athletes have significantly higher BMIs
c. one-tailed; that students who are athletes do not have significantly higher BMIs
d. two-tailed; that students who are athletes do not have significantly higher BMIs
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