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Solve it not to use excel. And step by step:D A production manager is interested in...

Solve it not to use excel. And step by step:D

A production manager is interested in comparing the precision of two brands of stamping machines. From a random sample of 12 units of output from the Brand A machine, a standard
deviation of 15.2 is reported for a quality characteristic. For the Brand B machine, in a
sample of 20 units of output, there is a standard deviation of 10.1. Is there sufficient evidence
at the 5% significance level to conclude that Brand B machines have a lower variance in
quality? Assume that the quality characteristic of both machines follows a normal
distribution.

Math   Statistics-And-Probability   
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