Mathematics, 16.05.2021 14:00 kealinwiley
In 2012, the mean monthly bill of cell phone users in a given city was 86.7 L. E. A sample of 35 cell phone bills from last year was found to average 92.3 L. E. with standard deviation of 14 L. E. Do the sample results indicate that the average cell phone bill has increased from 2012 to last year? Use a=10%.
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