Quality control engineers are trying to improve the number of unpopped kernels in their company's microwave popcorn.Changes to the oil have recently been made,so the engineers are testing the hypothesis $\mathrm { H } _ { 0 }$ : ? = 25 against $\mathrm { H } _ { \mathrm { A } }$ : ?

Question

Quality control engineers are trying to improve the number of unpopped kernels in their company's microwave popcorn.Changes to the oil have recently been made,so the engineers are testing the hypothesis $\mathrm { H } _ { 0 }$ : ? = 25 against $\mathrm { H } _ { \mathrm { A } }$ : ? < 25.

Quizplus · Accepted Answer

The engineers are testing to see if the mean number of unpopped kernels is less than 25. This is a one-sided or lower-tailed hypothesis since they are only interested in whether the number of unpopped kernels has decreased. Therefore, the best choice is C) Lower-tailed.

Quality Control Engineers Are Trying to Improve the Number of Unpopped