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At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours.  The principal introduces a campaign to encourage the students to watch less television.  One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased.  Formulate the null and alternative hypotheses for the study described.

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• Posted on Apr. 09, 2012 at 05:15:58AM
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Preview: ... e watching television per weak = 1 ...

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• Posted on Jun 29, 2012 at 4:40:28PM
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Preview: ... tive hypothesis is not true.   In this situation, the alternative hypothesis is: "T ...

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• Posted on Aug. 07, 2012 at 12:38:47AM
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