The city of Madison regularly checks the quality of water at swimming beaches located on area lakes.
Question:
(a) Calculate the sample variance.
(b) Calculate the sample standard deviation.
(c) One day, the water quality was bad-the reading was 1600 CFU-and the beach was closed. Drop this value and calculate the sample standard deviation for the days where the water quality was suitable for swimming. Comment on the change.
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Related Book For
Statistics Principles And Methods
ISBN: 9780470904114
7th Edition
Authors: Richard A. Johnson, Gouri K. Bhattacharyya
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