A random sample of 36 college graduates revealed that they worked an average of 7.25 years on the job before being promoted. The sample standard deviation was 12 years. The 99% confidence interval is...

The first question is correct. Please answer the second question.

Extracted text: A random sample of 36 college graduates revealed that they worked an average of 7.25 years on the job before being promoted. The sample standard deviation was 12 years. The 99% confidence interval is [ 1.802, 12.698 ] O [7.250, 19.250] O [2.724, 9.974] O [1.802, 7.250 ]


Extracted text: Using the same information in the previous question (Q13) and using a = 0.01, how would you treat the competing hypotheses? Họ: u = 7 years Hại H * 7 years O Fail to reject the null O Reject the null O Accept the null O Not enough information