Chapter 9.3, Problem 90E

(a)

To determine

To Explain: the one disadvantage of using $\alpha =0.10$ instead of $\alpha =0.05$ when performing the test.

Answer to Problem 90E

There is the most likely to have a type I error

Explanation of Solution

Type I error: Reject the null hypothesis $H_0$ , once the null hypothesis $H_0$ is true.

  $\alpha$ Showing the probability of a type I error

If increase $\alpha =0.05\text{to}\alpha =0.10,$ then the probability of a type I error increases and therefore would be more likely to make a type I error which is a disadvantage

(b)

To determine

To Explain: the one disadvantage of taking a random sample of 50 people instead of 30 people.

Answer to Problem 90E

There is more time consuming and costly to collect the data

Explanation of Solution

if increase the sample size of 30 people to 50 people, then it would be more time- consuming and costly to collect the data for the 50 people compared to the 30 twice (as there are almost twice as many potatoes about which we need to collect data) .