Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
6th Edition
ISBN: 9781337589383
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams, Jeffrey D. Camm, James J. Cochran
Publisher: Cengage Learning
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Chapter 19, Problem 18SE
To determine
Obtain the control limits for the
Find the standard deviation of the process.
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The means of two samples of sizes 50 and 100
respec-
tively are 54.1 and 50.3 and the standard deviations are 8 and 7. Obtain the
mean and standard deviation of the sample of size 150 obtained by combining
the two samples.
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of u = 8 parts
per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton
crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample
mean of
= 7.3ppb arsenic. It is known that o = 1.9 ppb for this type of data. Does this
information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical
approach. Use a = 0.01
What is the Decision (step 5) for this problem?
There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los
Banos well is less than 7.3 ppb.
O There is sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos
well is less than 8.0 ppb.
There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los
Banos well is less than 8.0 ppb.
O There is…
Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of µ = 8 parts
per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton
crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample
mean of
= 7.3ppb arsenic. It is known that o =
1.9ppb for this type of data. Does this
information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical
approach. Use a = 0.01
What is the calculation (step 4) for this problem?
Z = -2.34
z = 2.34
z = 2.24
z = -2.24
Chapter 19 Solutions
Bundle: Modern Business Statistics with Microsoft Office Excel, Loose-Leaf Version, 6th + MindTap Business Statistics, 2 terms (12 months) Printed Access Card
Ch. 19.2 - 1. A process that is in control has a mean of =...Ch. 19.2 - 2. Twenty-five samples, each of size 5, were...Ch. 19.2 - Prob. 3ECh. 19.2 - Prob. 4ECh. 19.2 - Prob. 5ECh. 19.2 - Prob. 6ECh. 19.2 - Prob. 7ECh. 19.2 - Prob. 8ECh. 19.2 - Prob. 9ECh. 19.3 - 10. For an acceptance sampling plan with n = 25...
Ch. 19.3 - Prob. 11ECh. 19.3 - Prob. 12ECh. 19.3 - 13. Refer to the KALI problem presented in this...Ch. 19.3 - Prob. 14ECh. 19 - Prob. 16SECh. 19 - Prob. 17SECh. 19 - Prob. 18SECh. 19 - The following are quality control data for a...Ch. 19 - The following were collected for the Master Blend...Ch. 19 - An insurance company samples claim forms for...Ch. 19 - Prob. 22SECh. 19 - 23. An n = 10, c = 2 acceptance sampling plan is...Ch. 19 - Prob. 24SE
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