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A sample of six records for repairs of a component showed the following costs: 93 97...

A sample of six records for repairs of a component showed the following costs: 93 97 89 79 81 87 Construct a 90% confidence interval for the standard deviation of the repair cost of this type of component. Assume that repair costs are normally distributed.

Math   Statistics-And-Probability   
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Answer #1

From the given sample data : n=6 , ,

The sample standard deviation is ,

Now ,

Therefore , the 90% confidence interval for the standard deviation of the repair cost of this type of component is ,

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