The American Water Works Association reports that, on average, men use between 40 L and 60 L
Question:
The American Water Works Association reports that, on average, men use between 40 L and 60 L of water daily to shave when they leave the water running. Suppose the following data are the numbers of litres of water used in a day to shave by 12 randomly selected men. Assume that the data come from a normal distribution. Use these data and a 5% level of significance to determine whether the population variance for such water usage is 2.5 L2.
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Business Statistics For Contemporary Decision Making
ISBN: 9781119577621
3rd Canadian Edition
Authors: Ken Black, Ignacio Castillo
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