The diameters​ (in inches) of 17randomly selected bolts produced by a machine are listed. Use a 90​% level of confidence to construct a confidence interval for ​(a) the population variance σ2 and ​(b)...



The diameters​ (in inches) of 17randomly selected bolts produced by a machine are listed. Use a 90​% level of confidence to construct a confidence interval for ​(a) the population variance σ2 and ​(b) the population standard deviation σ.
Interpret the results.


































4.473


4.431


4.007


4.326


4.008


3.758




3.828


3.766


4.246


3.933


4.128


4.551




3.968


3.759


3.886


3.836


4.468









​(a) The confidence interval for the population variance is


​(Round to three decimal places as​ needed.)



Jun 07, 2022
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