A cell phone user wants to determine what data plan she should get on her new contract. She selects a random sample of 15 months and finds her average usage to be 11.25 GB with a standard deviation of 2.5 GB. She wants to test H0: µ? 12 GB versus Ha: µ< 12 GB. What is the value of the test statistic and the associated p value?

What will be an ideal response?


t= -1.16,pvalue = 0.1324.

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