Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 59P
Use the following information to answer the next seven exercises. A distribution is given as X ~ Exp(0.75).
Draw the distribution.
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Reconsider the patient satisfaction data in Table 1. Fit a multiple regression model using both patient age and
severity as the regressors.
(a) Test for significance of regression.
(b) Test for the individual contribution of the two regressors. Are both regressor variables needed in the model?
(c) Has adding severity to the model improved the quality of the model fit? Explain your answer.
The output voltage of a power supply is assumed to be normally distributed. Sixteen observations taken at
random on voltage are as follows: 10.35, 9.30, 10.00, 9.96, 11.65, 12.00, 11.25, 9.58, 11.54, 9.95, 10.28, 8.37,
10.44, 9.25, 9.38, and 10.85.
(a) Test the hypothesis that the mean voltage equals 12 V against a two-sided alternative using a = 0.05.
(b) Construct a 95% two-sided confidence interval on μ.
(c) Test the hypothesis that σ² = 11 using α = 0.05.
(d) Construct a 95% two-sided confidence interval on σ.
(e) Construct a 95% upper confidence interval on σ.
(f) Does the assumption of normality seem reasonable for the output voltage?
Analyze the residuals from the regression model on the patient satisfaction data from Exercise 3. Comment on
the adequacy of the regression model.
Chapter 5 Solutions
Introductory Statistics
Ch. 5 - Consider the function f(x)=18 for 0x8 0. Draw the...Ch. 5 - The data the follow are the number of passengers...Ch. 5 - A distribution is given as X ~U(0, 20). What is...Ch. 5 - The total duration of baseball games in the major...Ch. 5 - Suppose the time it takes a student to finish a...Ch. 5 - The amount of time a service technician needs to...Ch. 5 - The amount of time spouses shop for anniversary...Ch. 5 - The number of days ahead travelers purchase their...Ch. 5 - On average, a pair of running shoes can last 18...Ch. 5 - Suppose that the distance, in miles, that people...
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Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - Use the following information to answer the net 16...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - For each probability and percentile problem, draw...Ch. 5 - Use the following information o answer the next...Ch. 5 - Use the following information o answer the next...Ch. 5 - Use the following information o answer the next...Ch. 5 - The time (In minutes) until the next bus departs a...Ch. 5 - Suppose that the value of a stock varies each day...Ch. 5 - A fireworks show is designed so that the time...Ch. 5 - The number of miles driven by a truck driver falls...Ch. 5 - Suppose that the length of long distance phone...Ch. 5 - Suppose that the useful life of a particular car...Ch. 5 - The percent of persons (ages five and older) in...Ch. 5 - The time (In years) after reaching age 60 that ft...Ch. 5 - The cost of all maintenance for a car during fts...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Use the following information to answer the next...Ch. 5 - Let X ~ Exp(0.l). a. decay rate = _________ b. ...Ch. 5 - Suppose that the longevity of a light bulb is...Ch. 5 - At a 911 call center, calls come in a an average...Ch. 5 - In major league baseball, a no-hitter is a game in...Ch. 5 - During the years 1998—2012. a total of 29...Ch. 5 - According to the American Red Cross. about one out...Ch. 5 - A web site experiences traffic during normal...Ch. 5 - At an urgent care faci11t; patients arrive at an...
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