Answers to the Practice Midterm

2. D, it's the only measure of spread on the list

3. A

4. D, again, sort the list, take the median of the first 50% of the list.

5a. B 5b. C 5c. D

6. Siblings is QT and D
State is QL
Calories is QT and C
Marital Status is QL

7. B

8. C

9. C. The chance of none of the rolls showing 4 or more spots in a single roll is 3/6 or 1/2 (rolling a 1, 2, or 3). Then do some multiplication 1/2 x 1/2 x 1/2 x 1/2 = .0625 or 6.25%

10. is B but you won't see anything like this on the midterm. Forget I even asked about the standard error for now.

11. is B but this comes from Chapter 16 and I promised that I'd only ask you stuff up to Chapter 14. You could probably figure this out with what you know already, but it isn't fair.

12. D. Use the rule of opposites. The chance of at least one working is 100% - chance of both failing to work. There is a 2% chance of complete failure or a 98% chance that both will work.

As I sit here writing your first midterm. I can tell you that there will be 3 probability problems out of the 10 problems. HINT review your conditional probability problems as I forgot to give you one in this practice midterm.