Listed here are the total electric energy consumption amounts (in kWh) for the home of a statistics professor during seven different years:

The utility company claims that the mean annual consumption amount is 11,000 kWh and offers a budget payment plan based on that amount. At the 0.05 significance level, test the utility company's claim that the mean is equal to 11,000 kWh.
Use the traditional approach summarized in Figure 7-4. Draw a graph showing the test statistic and critical values. In each case, assume that the population has a distribution that is approximately normal and that the sample is randomly selected.

Transcribed Image Text:

11,943 11,463 10,789 9907 9012 9942 11,153