As part of a water quality survey, you test the water hardness in several randomly selected streams.

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As part of a water quality survey, you test the water hardness in several randomly selected streams. The results are shown in the figure. Use a 95% level of confidence.

Assume the sample is from a normally distributed population and construct the indicated confidence intervals for

(a) The population variance σ2

(b) The population standard deviation σ. Interpret the results.

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Elementary Statistics Picturing The World

ISBN: 9780321911216

6th Edition

Authors: Ron Larson, Betsy Farber

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Question Posted: Nov 24, 2015 07:53 AM

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As part of a water quality survey, you test the water hardness in several randomly selected streams.

Question:

Water quality surve n 19 s 15 grains/gallon

Step by Step Answer:

a n 1s 2 X R 2 n 1s 2 X L 2 18 15 2 31526 18 15 2 8231 128 ...View the full answer

Elementary Statistics Picturing The World

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