Suppose the time it takes college students to complete their degree follows a No

Question

Suppose the time it takes college students to complete their degree follows a Normal distribution, with mean and standard deviation = 1.2 years. Based on random sample of college students, you construct a 95% confidence interval for and find it to be 1.15 ± 0.08. Which statement is TRUE?

A test of the hypotheses H0: = 1.2, Ha: 1.2 would be rejected at the 0.05 level.

A test of the hypotheses H0: = 1.1, Ha: 1.1 would be rejected at the 0.05 level.

All of the above

A test of the hypotheses H0: = 0, Ha: 0 would be rejected at the 0.05 level.

Explanation / Answer

At 99% C.I = 1.15 ± 0.08
= [1.07, 1.23]
[ANSWER]
A test of the hypotheses H0: = 0, Ha: 0 would be rejected at the 0.05 leve

Since the value = 1.2, = 1.1 lies in the interal received, = 0 lies outside
interval and it is rejected here

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