Story, Dale                                                                                                                                                        10/19/2014
POLS  3310

REVIEW QUESTIONS FOR FINAL, PT. I

2. Given these results of two Likert scaled items, which of these items has the highest “discriminatory power” (DP)?  Use the DP index.  Show all your work.

	Group	N	1	2	3	4	5
Item 1	Highest 25%	10	0	1	2	3	4
	Lowest 25%	10	4	3	2	1	0
Item 2	Highest 25%	10	1	1	3	2	3
	Lowest 25%	10	3	2	2	3	0

11. Given this sample of ten respondents, calculate the mean and variance for each of these approval ratings for two presidents.

	President	President
	A	B
1	78	79
2	85	83
3	90	85
4	70	77
5	75	75
6	92	90
7	82	81
8	65	75
9	68	70
10	95	85

12. If presidential approval ratings are normally distributed with a mean of 60 and a standard deviation of 8:
    1. What are the Z or standard scores for the following values of presidential approval rating.
       1. 60
       2. 80
       3. 56
       4. 68
       5. 48
    2. What percentage of the cases:
       1. are less than 44 and greater than 68
       2. are less than 60
       3. are between 52 and 60
       4. are between 68 and 76
       5. are greater than 76.