1. Probability & Statistics Sections 2.3, 2.4

2. A. The mean is very low. B. The data values are all very close in value. C. The data values must all be the same. D. All the data values must be 0.

3.  Find the range of the stem-and-leaf plot 51212 60 4 6 7 7 70 2 2 9 81 4 6 6 6 9 9 108 8 8 9 114 5 Key 5|1=5.1 6.4

4. A. 3 B. 3 or -3 C. -3 D. 81 If the sample variance is calculated and found to be s 2 = 9, what is the standard deviation?

5. A. 61.5 B. 7.8 C. 246 D. 7.0 Given the extension table below, find the sample standard deviation using the formula for the sample variance. x 24-10100 3739 3400 4511121 30-416

6. A. age of college students at local community college B. heights of college students C. grades on a very difficult statistics exam D. age at which death occurs

7. A. 3, 3, 3, 3, 3 B. 0, 3, 3, 3, 6 C. 1, 4, 2, 2, 6 D. 3, 3, 3, 3, 5

8. A. 2 B. 6 C. 8 D. 7

9. A. 46 B. 50 C. 48 D. 38

10. A. 60 B. 65 C. 70 D. 75 E. 85 The histogram of 19 exam scores is given below. Estimate the median score.

11. A. 2, 3, 4, 2, 6 B. 1, 6, 5, 4, 1 C. 7, 1, 1, 2, 6 D. 2, 2, 1, 1, 4

12. A. 7, 7, 7, 5, 2 B. 1, 1, 3, 4, 5 C. 8, 3, 7, 3, 2 D. 5, 5, 5, 1, 1

13. A. midrange B. median C. mean D. mode

14. A. uniform B. symmetric C. right-skewed D. left-skewed

15. A. 6 B. 21 C. 23 D. 10.5