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Applied Statistics and Probability for Engineers | 6th Edition | ISBN: 9781118539712 | Authors: Douglas C. Montgomery, George C. Runger
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From the data on the pH of rain in Ingham County,

Chapter 8, Problem 57E

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QUESTION:

From the data on the pH of rain in Ingham County, Michigan:

5.47        5.37        5.38        4.63        5.37        3.74        3.71        4.96        4.64        5.11        5.65

5.39        4.16        5.62        4.57        4.64        5.48        4.57        4.57        4.51        4.86        4.56

4.61        4.32        3.98        5.70        4.15        3.98        5.65        3.10        5.04        4.62        4.51

4.34        4.16        4.64        5.12        3.71        4.64

Find a two-sided 95% confidence interval for the standard deviation of pH.

Questions & Answers

QUESTION:

From the data on the pH of rain in Ingham County, Michigan:

5.47        5.37        5.38        4.63        5.37        3.74        3.71        4.96        4.64        5.11        5.65

5.39        4.16        5.62        4.57        4.64        5.48        4.57        4.57        4.51        4.86        4.56

4.61        4.32        3.98        5.70        4.15        3.98        5.65        3.10        5.04        4.62        4.51

4.34        4.16        4.64        5.12        3.71        4.64

Find a two-sided 95% confidence interval for the standard deviation of pH.

ANSWER:

Step 1 of 3

Given,

The sample size,

The confidence interval, CI = 95%

The Confidence Interval on the Variance is given as,

                                                         

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