Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
9th Edition
ISBN: 9798214004020
Author: Jay L. Devore
Publisher: Cengage Learning US
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Chapter 9.2, Problem 20E
Use the data of Exercise 19 to calculate a 95% CI for the difference between true average stopping distance for cars equipped with system 1 and cars equipped with system 2. Does the interval suggest that precise information about the value of this difference is available?
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What does MS between reflects?
A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to increase the mean speed of the film, and believes that this can be achieved by reducing the thickness of the film to 20 mils. Eight
samples of each film thickness are manufactured in a pilot production process, and the film speed (in microjoules per square inch) is measured. For the 25-mil film, the sample data result is = 1.15 and 81 = 0.11, while for the 20-mil film,
the data yield 2 = 1.06 and 82 = 0.09. Note that an increase in film speed vould lower the value of the observation in microjoules per square inch.
(a) Do the data support the claim that reducing the film thickness increases the mean speed of the film? Use a = 0.10 and assume that the two population variances are equal and the underlying population of film speed is normally
distributed. What is the P-value for this test? Round your answer to three decimal places (e.g. 98.765).
The data
the claim that reducing the film…
A photoconductor film is manufactured at a nominal thickness of 25 mils. The product engineer wishes to
increase the mean speed of the film and believes that this can be achieved by reducing the thickness of the film to
20 mils. Eight samples of each film thickness are manufactured in a pilot production process, and the film speed
(in microjoules per square inch) is measured. For the 25-mil film, the sample data result is.x₁ = 1.15 and
S₁ = 0.11, while for the 20-mil film, the data yield 2 = 1.06 and s2 = 0.09. Note that an increase in film speed
would lower the value of the observation in microjoules per square inch.
Do the data support the claim that reducing the film thickness increases the mean speed of the film? Use
a = 0.10 and assume that the two population variances are equal and the underlying population of film speed is
normally distributed.
The appropriate decision for the test is to reject the null hypothesis
True
False
Chapter 9 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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