Chapter 9, Problem 151SE

a.

To determine

Find the risk that the adhesive will be judged acceptable when the true mean pull-off force is only 73 pounds and when only 72 pounds if the true standard deviation is $\sigma =1$.

b.

To determine

Find the sample size required to give a 90% chance of detecting that the true mean is only 72 pounds when $\sigma =1$.

c.

To determine

Rework parts (a) and (b) assuming that $\sigma =2$ and to explain the impact of increasing values of $\sigma$ on the answers.