6th Edition

ISBN: 9781259957598

Author: DOANE

Publisher: RENT MCG

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A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Textbook Question

Chapter 9.6, Problem 54SE

A Realtor claims that no more than half of the homes he sells are sold for less than the asking price. When reviewing a random sample of 12 sales over the past year, he found that actually 10 were sold below the asking price. (a) Would we be justified in assuming that the sample proportion p is normally distributed? Explain. (b) Calculate a p-value for the observed sample outcome, using the normal distribution. At the .05 level of significance in a right-tailed test, is the proportion of homes sold for less than the asking price greater than 50%? (c) Use Excel to calculate the binomial probability P(X ≥ 10 | n = 12, π = .50) = 1 – P(X ≤ 91 n = 12, π = .50).

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 9.6, Problem 53SE

Chapter 9.6, Problem 55SE

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Chapter 9 Solutions

APPLIED STAT.IN BUS.+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Ch. 9.2 - If you repealed a hypothesis test 1,000 times (in...Ch. 9.2 - Define Type I and Type II errors for each...Ch. 9.2 - A firm decides to test its employees for illegal...Ch. 9.2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 - Prob. 39SE 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 - A Realtor claims that no more than half of the...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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