Question

The American Water Works Association reports that, on average, men use between 10 and 15 gallons of water daily to shave when they leave the water running.
Suppose the following data are the numbers of gallons of water used in a day to shave by 12 randomly selected men and the data come from a normal distribution of data. Use these data and a 5% level of significance to test to determine whether the population variance for such water usage is 2.5 gallons squared.


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  • CreatedFebruary 19, 2015
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