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Why are the x2 tests non parametric tests, and what does this mean? A researcher believes that the percentage of people who exercise in California

Why are the x2 tests non parametric tests, and what does this mean?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%, The researcher gathers a random sample of 120 individuals who live in California and finds the number who exercise regularly is 31 out of 120.

a. What is x2obt?

b. What is (are) the df for this test?

c. What is x2cv?

d. What conclusion should be drawn from these results?

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