Homework Assignments Module 5.

Complete the Chapter 13 textbook homework assignment: 13.21 & 13.41.

13-21. A marketing research firm is conducting a study to determine if there is a relationship between an individual's age and the individual's preferred source of news. The research firm asked 1,000 individuals to list their preferred source for news: newspaper, radio and television, or the Internet. The following results were obtained:

Age of Respondent

Preferred News Source 20-30 31-40 41-50 Over 50

Newspaper 19 62 95 147

Radio/TV 27 125 168 88

Internet 104 113 37 15

At the 0.01 level of significance, can the marketing research firm conclude that there is a relationship between the age of the individual and the individual's preferred source for news?

13-41. Cooper Manufacturing has a contract with the U.S. Air Force to produce a part for a new fighter plane being manufactured. The part is a bolt with specifications requiring that the length be normally distributed with a mean of 3.05 inches and a standard deviation of 0.015 inch. As part of the company's quality-control efforts, each day Cooper's engineers select a random sample of 100 bolts produced that day and carefully measure the bolts to determine whether they meet the specifications. The following data were collected yesterday:

Length (inches) Frequency

Under 3.030 5

3.030 and under 3.035 16

3.035 and under 3.040 7

3.040 and under 3.050 20

3.050 and under 3.060 36

3.060 and under 3.065 8

3.065 and over 8

Based on these sample data, what should Cooper's engineers conclude about the production output if they test using an =0.01?=0.01? Discuss.