Accept Ho if the sample mean xbar is ≥ 124

Reject Ho if the sample mean xbar is < 124

(i)Find the probability of making a Type I error.

(ii)If the true mean is 123.75 hours, find the probability of Type II error and hence the power of the test.

(iii)Suppose that the investigator wants the probability of Type I error fixed at α=0.05. Revise his decision criteria by finding a value of the sample mean below which he should reject Ho. Also calculate the power of this test when the true mean is 123.75 hours.

**Now, i have got part (i) answer as 0.0228. However i am not sure how to go about doing (ii). I have ideas in my head that i am finding hard to visualise. Part (iii) i can manage i think, although guidance would be awesome**