Essentials of Statistics for Business and Economics
9th Edition
ISBN: 9780357118191
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams
Publisher: Cengage Learning US
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Chapter 12, Problem 28SE
Quality Comparison Across Production Shifts. Arconic Inc. is a producer of aluminum components for the avionics and automotive industries. At its Davenport Works plant, an engineer has conducted a quality-control test in which aluminum coils produced in all three shifts were inspected. The study was designed to determine if the population proportion of good parts was the same for all three shifts. Sample data follow.
- a. Using a .05 level of significance, conduct a hypothesis test to determine if the population proportion of good parts is the same for all three shifts. What is the p-value and what is your conclusion?
- b. If the conclusion is that the population proportions are not all equal, use a multiple comparison procedure to determine how the shifts differ in terms of quality. What shift or shifts need to improve the quality of parts produced?
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30. An individual who has automobile insurance from a certain company is randomly selected. Let Y be the num- ber of moving violations for which the individual was cited during the last 3 years. The pmf of Y isy | 1 2 4 8 16p(y) | .05 .10 .35 .40 .10
a.Compute E(Y).b. Suppose an individual with Y violations incurs a surcharge of $100Y^2. Calculate the expected amount of the surcharge.
24. An insurance company offers its policyholders a num- ber of different premium payment options. For a ran- domly selected policyholder, let X = the number of months between successive payments. The cdf of X is as follows:
F(x)=0.00 : x < 10.30 : 1≤x<30.40 : 3≤ x < 40.45 : 4≤ x <60.60 : 6≤ x < 121.00 : 12≤ x
a. What is the pmf of X?b. Using just the cdf, compute P(3≤ X ≤6) and P(4≤ X).
Chapter 12 Solutions
Essentials of Statistics for Business and Economics
Ch. 12.1 - Use the sample data below to test the...Ch. 12.1 - reconsider the observed frequencies in exercise 1...Ch. 12.1 - Late Flight Comparison Across Airlines. The sample...Ch. 12.1 - Electronic Component Supplier Quality Comparison....Ch. 12.1 - Research Classification of Higher Education. The...Ch. 12.1 - Error Rates in Tax Preparation. A tax preparation...Ch. 12.1 - Use of Social Media. Social media is becoming more...Ch. 12.1 - Supplier Quality: Three Inspection Outcomes. The...Ch. 12.2 - The following table contains observed frequencies...Ch. 12.2 - The following table contains observed frequencies...
Ch. 12.2 - Airline Ticket Purchases for Domestic and...Ch. 12.2 - Hiring and Firing Plans at Private and Public...Ch. 12.2 - Generational Differences in Workplace Attitudes....Ch. 12.2 - Vehicle Quality Ratings. A J. D. Power and...Ch. 12.2 - Company Reputation and Management Quality Survey....Ch. 12.2 - Academy Awards and Movie Fan Sentiment. The race...Ch. 12.2 - Amount of Sleep by Age Group. The National Sleep...Ch. 12.2 - Prob. 18ECh. 12.3 - Test the following hypotheses by using the 2...Ch. 12.3 - The following data are believed to have come from...Ch. 12.3 - Television Audiences Across Networks. During the...Ch. 12.3 - M&M Candy Colors. Mars, Inc. manufactures M&M’s,...Ch. 12.3 - Shareholder Scoreboard Ratings. The Wall Street...Ch. 12.3 - Traffic Accidents by Day of Week. The National...Ch. 12.3 - Daily High Temperatures. Bob Feller, an Iowa...Ch. 12.3 - Weekly Demand at Whole Foods Market. The manager...Ch. 12 - Where Millionaires Live in America. In a 2018...Ch. 12 - Quality Comparison Across Production Shifts....Ch. 12 - Ratings of Most-Visited Art Museums. As listed by...Ch. 12 - Pace-of-Life Preference By Gender. A Pew Research...Ch. 12 - Church Attendance by Age Group. The Barna Group...Ch. 12 - Ambulance Calls by Day of Week. An ambulance...Ch. 12 - Attitudes Toward New Nuclear Power Plants. A...Ch. 12 - America’s Favorite Sports. The Harris Poll tracks...Ch. 12 - Best-Selling Small Cars in America. Based on 2017...Ch. 12 - Prob. 36SECh. 12 - Testing If Daily Sales Obey a Binomial Probability...Ch. 12 - In a study conducted by Zogby International for...Ch. 12 - Six months ago, Fuentes Salty Snacks, Inc., added...Ch. 12 - Fresno Board Games manufactures and sells several...
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