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.

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The Answer of 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.

A Production Manager Is Interested in Comparing the Precision of Two