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how can I find the p-value of the information below? Cox Internet claims that their average download speed is 200mpbs (megabytes per second). I execute

how can I find the p-value of the information below?

Cox Internet claims that their average download speed is 200mpbs (megabytes per second)."

I execute the "Cox Internet Speed Test" and record the results of 30 trials and get a sample mean of 175mpbs and a sample standard deviation of 15mpbs.

Do I have enough evidence to "reject" their claim that the average download speed is 200mbs?

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