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CH 9: Null Hypothesis

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CH9 

Q 1 A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand.  State the null hypothesis and the alternative hypothesis for a test of significance.

Q 2 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.  

Q 3 A two-tailed test is conducted at the 5% significance level. What is the P-value required to reject the null hypothesis?
Solution
Each of the above questions have been answered in the attached solution. Here the approach and the rationale (wherever necessary) have been included. 
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