John, a young teenager, established a mean time of 16.43 seconds for running in a 100m dash, with a standard deviation of 0.8 seconds. His dad, Bill, thought that John could swim the 100m dash using cycling shorts. Bill bought John a pair of cycling shorts and timed John for 15 100m dashes. For the 15 runs, John's mean time was 16 seconds. Bill thought that the shorts helped John to run faster than the 16.43 seconds. Conduct a hypothesis test using a preset = 0.05

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