A researcher believes that the percentage of people who exercise in California is greater than the nation exercise rate. the national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number who exercise regularly is 31 out of 120.
a. What is the x² obt?
b. What is df for this test?
c. What is x² cv?
d. What conclusion should be drawn from these results?