Stat 160 quiz: Over Sections 10.1-10.5

This work is to be submitted for credit. Attempt all problems. Make sure you have attempted all problems before you submit. You may solve the problems several times, but only the first submission gets credit. Remember, don't hit the enter key until you are ready to submit this quiz.

Please fill out the information below.

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