Question

A process is considered to be performing to acceptable standards if its mean is at least 300.  To  determine whether the process has to be reconfigured, a plant manager wants  to determine if there is evidence       that the process mean is below 300. Experience has shown that the process is normally distributed with        a standard deviation of   20.

1. In this situation, a Type I error would be made when it is concluded that µ is ______ 300 when infact µ is ____ 300.

	a	equal to; greater than
	b	greater than; less than or equal  to
	c	not equal to; equal to
	d	below; equal or greater than

Answer 1

Here the claim is that  the process mean is below 300.

Which means hypothesis is vs

Type I error is rejection of true null hypothesis

For this situation, type 1 error would be occurred when we concluded mean is less than 300, but actually it was 300.

So answer here is a Type I error would be made when it is concluded that µ is below 300 when infact µ is equal or greater than 300.

So correct answer here is d. below; equal or greater than