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    One tail test at 5% level of significance

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    A recent national study found that the average high schools student rented 6.3 videos per month. A random sample of 36 college students found that they rented 6.4 per month with a deviation of 0.5. At the 0.05 α, using a 1 tail test can we conclude that the college students watch more videos a month than the high school students?
    Here is a case where we did not know the population standard deviation but because we did the sample study, we could generate our own sample standard deviation. It is perfectly permissible to use it

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