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Twenty (20) randomly selected students were asked how many hours they spend each week watching television....

Twenty (20) randomly selected students were asked how many hours they spend each week watching television. They reported a sample mean and standard deviation of 26.4 and 8.2 respectively. Assume that the population of times is approximately normal. Test at the 0.05 level the claim that the mean number of hours per week spent by all students is greater than 20. The null and alternative hypothesis to conduct the test is

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