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Question

Maher Saddles, Inc., produces bicycle seats. Maher's operations manager has recently made a change in the

production process for the company's high-end seat. After waiting for the process to become stable, he took a random sample of 25 assembly times and found a standard deviation of 47 seconds. He recognizes this is only a point estimate of the variation in completion times and so wants to report both a 90% and a 95% confidence interval estimate for the population variance.

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The 90% confidence interval estimate for the population variance... View the full answer

90% CI for Variance_120119.png

Confidence Interval Estimate for the Population Variance
Data
Sample Size
25
Sample Standard Deviation
47
Confidence Level
95%
Intermediate Calculations
Degrees of Freedom
24
Sum of Squares
53016...

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