In a recent year, the Federal Communications Commission reported that the mean wait for repairs for AT&T customers was 25.3 hours. In an effort to improve this service, suppose that a new repair service process was developed. The new process, used for a sample of 100 repairs, resulted in a sample mean of 22.3 hours and a sample standard deviation of 8.3 hours. *If needed … you can use < or > or = or you can type those out as greater than, less than, or equal to a. Write the null and alternate hypotheses for a statistical test to determine if there is evidence that the average wait time of repairs for AT&T customers is less than 25.3 hours. b. Find the critical value of the t-statistic with a 1% level of significance. c. Find the t-test statistic from the sample data. d. Find the p-value. e. State the conclusion reached by the Federal Communications Commissions and AT&T.
In a recent year, the Federal Communications Commission reported that the mean wait for repairs for AT&T customers was 25.3 hours. In an effort to improve this service, suppose that a new repair service process was developed. The new process, used for a sample of 100 repairs, resulted in a sample mean of 22.3 hours and a sample standard deviation of 8.3 hours.
*If needed … you can use < or > or = or you can type those out as greater than, less than, or equal to
a. Write the null and alternate hypotheses for a statistical test to determine if there is evidence that the average wait time of repairs for AT&T customers is less than 25.3 hours.
b. Find the critical value of the t-statistic with a 1% level of significance.
c. Find the t-test statistic from the sample data.
d. Find the p-value.
e. State the conclusion reached by the Federal Communications Commissions and AT&T.
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