The diameters (in inches) of 18 randomly selected bolts produced by a machine are listed. Use a

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The diameters (in inches) of 18 randomly selected bolts produced by a machine are listed. Use a 95% level of confidence.

4.477 4.425 4.034 4.317 4.003 3.760 3.818 3.749 4.240 3.941 4.131 4.545 3.958 3.741 3.859 3.816 4.448 4.206


Assume the sample is from a normally distributed population and construct the indicated confidence intervals for 

(a) The population variance σ2 and 

(b) the population standard deviation σ. Interpret the results.

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