Chapter 9 Solutions

Applied Statistics in Business and Economics

Ch. 9.2 - If you repealed a hypothesis test 1,000 times (in...Ch. 9.2 - Define Type I and Type II errors for each...Ch. 9.2 - A firm decides to test its employees for illegal...Ch. 9.2 - A hotel installs smoke detectors with adjustable...Ch. 9.2 - What is the consequence of a false negative in an...Ch. 9.2 - Prob. 6SE Ch. 9.3 - A manufacturer claims that its compact fluorescent...Ch. 9.3 - Prob. 8SE Ch. 9.3 - Prob. 9SE Ch. 9.3 - The average age of a part-time seasonal employee...

Ch. 9.3 - Prob. 11SE Ch. 9.3 - Prob. 12SE Ch. 9.4 - Find the zcalc test statistic for each hypothesis...Ch. 9.4 - Prob. 14SE Ch. 9.4 - Prob. 15SE Ch. 9.4 - Prob. 16SE Ch. 9.4 - Green Beam Ltd. claims that its compact...Ch. 9.4 - The mean potassium content of a popular sports...Ch. 9.4 - Calculate the test statistic and p-value for each...Ch. 9.4 - Determine the p-value for each test statistic. a....Ch. 9.4 - Procyon Mfg. produces tennis balls. Weights are...Ch. 9.4 - The mean arrival rate of flights at OHare Airport...Ch. 9.4 - Prob. 23SE Ch. 9.4 - The Scottsdale fire department aims to respond to...Ch. 9.4 - The lifespan of xenon metal halide arc-discharge...Ch. 9.4 - Discuss the issues of statistical significance and...Ch. 9.4 - The target activation force of the buttons on a...Ch. 9.5 - Find the tcalc test statistic for each hypothesis...Ch. 9.5 - Find the critical value of Students t for each...Ch. 9.5 - Find the critical value of Students t for each...Ch. 9.5 - Find the tcalc test statistic for each hypothesis...Ch. 9.5 - Estimate the p-value as a range using Appendix D...Ch. 9.5 - Prob. 33SE Ch. 9.5 - Prob. 34SE Ch. 9.5 - Prob. 35SE Ch. 9.5 - The manufacturer of an airport baggage scanning...Ch. 9.5 - Prob. 37SE Ch. 9.5 - The average weight of a package of rolled oats is...Ch. 9.5 - According to J.D. Power & Associates, the mean...Ch. 9.5 - Prob. 40SE Ch. 9.5 - Prob. 41SE Ch. 9.5 - Prob. 42SE Ch. 9.5 - Prob. 43SE Ch. 9.6 - Interpret each p-value in your own words: a....Ch. 9.6 - Prob. 45SE Ch. 9.6 - Prob. 46SE Ch. 9.6 - May normality of the sample proportion p be...Ch. 9.6 - Prob. 48SE Ch. 9.6 - In a hospitals shipment of 3,500 insulin syringes,...Ch. 9.6 - Prob. 50SE Ch. 9.6 - Prob. 51SE Ch. 9.6 - The recent default rate on all student loans is...Ch. 9.6 - Prob. 53SE Ch. 9.6 - Prob. 54SE Ch. 9.6 - BriteScreen, a manufacturer of 19-inch LCD...Ch. 9.6 - Perfect pitch is the ability to identify musical...Ch. 9.7 - A quality expert insects 400 items to test whether...Ch. 9.7 - Prob. 58SE Ch. 9.7 - For a certain wine, the mean pH (a measure of...Ch. 9.7 - Repeat the previous exercise, using = .05. For...Ch. 9.8 - A sample of size n = 15 has variance s2 = .35. At ...Ch. 9.8 - Prob. 62SE Ch. 9.8 - A sample of size n = 19 has variance s2 = .1.96....Ch. 9.8 - Prob. 64SE Ch. 9.8 - Prob. 65SE Ch. 9 - (a) List the steps in testing a hypothesis, (b)...Ch. 9 - (a) Explain the difference between the null...Ch. 9 - (a) Why do we say fail to reject H0 instead of...Ch. 9 - (a) Define Type I error and Type II error. (b)...Ch. 9 - (a) Explain the difference between a left-tailed...Ch. 9 - Prob. 6CR Ch. 9 - Prob. 7CR Ch. 9 - (a) Why do we prefer low values for and ? (b) For...Ch. 9 - Prob. 10CR Ch. 9 - Prob. 11CR Ch. 9 - (a) Explain what a p-value means. Give an example...Ch. 9 - Prob. 13CR Ch. 9 - (a) What does a power curve show? (b) What factors...Ch. 9 - (a) In testing a hypothesis about a variance, what...Ch. 9 - Suppose you always reject the null hypothesis,...Ch. 9 - Suppose the judge decides to acquit all...Ch. 9 - High blood pressure, if untreated, can lead to...Ch. 9 - A nuclear power plant replaces its ID card...Ch. 9 - A test-preparation company advertises that its...Ch. 9 - Prob. 71CE Ch. 9 - Prob. 72CE Ch. 9 - Prob. 73CE Ch. 9 - Pap smears are a test for abnormal cancerous and...Ch. 9 - Prob. 75CE Ch. 9 - Prob. 76CE Ch. 9 - Malcheon Health Clinic claims that the average...Ch. 9 - The sodium content of a popular sports drink is...Ch. 9 - A can of peeled whole tomatoes is supposed to...Ch. 9 - At Ajax Spring Water, a half-liter bottle of soft...Ch. 9 - Prob. 81CE Ch. 9 - Prob. 82CE Ch. 9 - A U.S. dime weighs 2.268 grams when minted. A...Ch. 9 - A coin was flipped 60 times and came up heads 38...Ch. 9 - Prob. 85CE Ch. 9 - Prob. 86CE Ch. 9 - Prob. 87CE Ch. 9 - Prob. 88CE Ch. 9 - Prob. 89CE Ch. 9 - Prob. 90CE Ch. 9 - Prob. 91CE Ch. 9 - Prob. 92CE Ch. 9 - The average service time at a Noodles Company...Ch. 9 - Prob. 94CE Ch. 9 - Prob. 95CE Ch. 9 - Beer shelf life is a problem for brewers and...Ch. 9 - Prob. 97CE Ch. 9 - Prob. 99CE Ch. 9 - Prob. 100CE Ch. 9 - Prob. 101CE Ch. 9 - Prob. 102CE Ch. 9 - An experimental medication is administered to 16...Ch. 9 - The historical on-time percentage for Amtraks...Ch. 9 - After 7 months, none of 238 angioplasty patients...Ch. 9 - A certain brand of flat white interior latex paint...Ch. 9 - Prob. 107CE Ch. 9 - Prob. 108CE Ch. 9 - Prob. 109CE

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Interpret each p -value in your own words: a. p -value = .387, H 0 : π ≥ .20, H 1 : π &lt; . 20 , α = . 10 b. p -value = .043, H 0 : π ≤ .90, H 1 : π &gt; . 90 , α = . 05 c. p -value = .387, H 0 : π = .50, H 1 : π ≠ .5 0 , α = . 01

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Chapter 9 Solutions

Interpret each p -value in your own words: a. p -value = .387, H 0 : π ≥ .20, H 1 : π < . 20 , α = . 10 b. p -value = .043, H 0 : π ≤ .90, H 1 : π > . 90 , α = . 05 c. p -value = .387, H 0 : π = .50, H 1 : π ≠ .5 0 , α = . 01