As part of a water quality survey, you test the water hardness in several randomly selected streams.
Question:
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.
Transcribed Image Text:
Water quality surve n 19 s 15 grains/gallon
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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
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Related Book For
Elementary Statistics Picturing The World
ISBN: 9780321911216
6th Edition
Authors: Ron Larson, Betsy Farber
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