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A local Internet company claims that they offer wifi speeds in residential settings of 250 MBPs....

A local Internet company claims that they offer wifi speeds in residential settings of 250 MBPs. A consumer group suspects the actual average is far less than 250 MBPs. They take a sample of 20 wifi signals by the Internet company and calculate the average to be 260 MBPs. The signals are normally distributed with a standard deviation of 18. State the appropriate null and alternative hypotheses. Compute the value of the test statistic. Compute the p-value. What can we conclude at the 5% significance level regarding the null hypothesis?

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