Chapter 10, Problem 6CRE

(a)

To determine

To Explain: the reason that it is not secure to utilize the procedure of the chapter to perform inference in every of the setting on the basis of given information.

Answer to Problem 6CRE

Normal requirement has not been met.

Explanation of Solution

Three conditions if using the inference procedure of this chapter are random, independent and normal. The normal requirement for differentiating two proportions is that the number is not success and success is at least 10 for the both of the samples. It is observed that this requirement is not satisfied, the reason is that the second sample is having 10 successes out of 17 and therefore also 7 failures (less than 7)

(b)

To determine

To Explain: the reason that it is not secure to utilize the procedure of the chapter to perform inference in every of the setting on the basis of given information.

Answer to Problem 6CRE

Normal requirement is not met.

Explanation of Solution

Given:

  

Three conditions if using the inference procedure of this chapter are random, independent and normal. The normal requirement for differentiating two means is that the sample distribution is about normal and having no outlier. It is observed that this requirement is not satisfied, the reason is that the males’ sample is having 2 outliers which is indicated by the two dots in the box plot.