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The following sample of lengths was taken from 9 rods off the assembly line. Construct the...

The following sample of lengths was taken from 9 rods off the assembly line. Construct the 99% confidence interval for the population standard deviation for all rods that come off the assembly line. Round your answers to two decimal places.

13.6,13.8,14.1,13.6,13.3,13.5,13.9,13.3,14.1

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

From the given sample data : n=9 , ,

The sample standard deviation is ,

Now ,

The Excel function is , =CHIINV(0.995,8)

The Excel function is , =CHIINV(0.005,8)

Therefore , the 99% confidence interval for the population standard deviation for all rods that come off the assembly line is ,

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