Other changes and the P-value. Refer to the previous exercise.

(a) What happens to the P-values when you change the significance level a to 0.01? Explain the result.

(b) What happens to the P-values when you change the sample size n from 10 to 40? Explain the result.

6.89 Why is it significant at the 5% level? Explain in plain language why a significance test that is significant at the 1% level must always be significant at the 5% level.