Stat 160 quiz: Over Sections 10.1-10.5



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1.     Polls concerning the president's approval rating were taken in the state of Michigan. Which of the following is a 95% confidence interval of the difference in approval ratings within the state?
          Approve    Disapprove   Didn't answer
Michigan      50         25             60

(.185,.185)
(.0914,.57)
(.063,.306)
(-.0914,.0914)
2.If the 95% Confidence Interval for problem #1 turned out to be (.234,.434) what would be your conclusion regarding the president's approval rating?

No difference between approval and disapproval since 0 is not in the Confidence Interval.
There is a difference between approval and disapproval since 0 is not in the Confidence Interval
No difference between approval and disapproval since 0 is in the confidence interval
There re too many "Didn't Answers."
3. Consider the following data from a weight loss clinic. This experiment has been designed to be a Randomized Pair Design. In performing the Sign Rank Wilcoxon test, what is the test statistic W given the following data?
	Patient		Weight Before	Weight After	Difference
	1		250		200		-50
	2		180		160		-20
	3		110		120		10
	4		300		276		-24
	5		100		105		5

1.96
-11
0
3
4.Given the data in problem #3, what is the expected value of W (test statistic) assuming the Null Hypothesis is true?

15
12.5
7.5
1.96

5.In reference to the data in problem #3, what is the estimate of delta, the amount of weight you will lose?

-20
0
-7.5
8.5