Question

Exhibit 11-10 n = 81 s2 = 625 H0: σ2 = 500 Ha: σ2 ≠ 500 At 95% confidence, the null hypothesis _____. a. should not be rejected b. should be revised c. should be rejected d. None of these answers are correct

Answer 1

Option C

Explanation:

n = 81

s2 = 625

H0: σ2 = 500

Ha: σ2 ≠ 500

Test Statistics X^2 = (n-1)s^2/ σ2 = (81-1)*625/500

X^2 = 100

P value = 0.0646 for degree of freedom = 81-1 = 80

And X^2 = 100

At 95% confidence interval

Alpha = 0.05 , p value = 0.0646

p < alpha, we will reject the null hypothesis

At 95% confidence, the null hypothesis