Quiz STAT

Review Questions for the Midterm

Questions 1-10 classify the following variables as:

a. Nominal

b. Ordinal

c. Ratio

d. Interval

1. _____ Number of goals scored by a team during a season

2. _____ Number of audit units Winter quarter students register for

3. _____ Blood type of white males at LLUMC

4. _____ Stages of cancer

5. _____ Zip codes

6. _____ Region of the country (1= East, 2= South, 3= Midwest, 4= West)

7. _____ Social security numbers

8. _____ Final letter grades given in data analysis & management class

9. _____ Ability of children to reach over their head with their right hand and touch the top of their left ear

10. _____ Commuting times to work

Questions 11-14 compute the following

ID Waiting time at a bank (in minutes)

1 10

2 17

3 8

4 15

5 12

6 13

7 14

8 16

9 35

10 18

11 35

11. Find the (a) mean, (b) median, (c) mode for the waiting time variable?

12. Find the (a) variance, (b) standard deviation, (c) range, interquartile range for the waiting time variable?

13. Is there any extreme outliers? If yes, how many?

14. What the best measure of central tendency to summarize the waiting time?

Questions 15-18: Answer the following questions regarding the contingency table:

		Gender	Total
Class attendance		Male	Female
	Yes	9	11
	No	6	4
Total

15. What is the probability of no attendance?

16. What is the probability of class attendance among the males?

17. What is the probability of attending class or not attending class?

18. What is the probability of attending class and being a male?

Questions 18-22 In 6 trials of flipping a coin, assuming the chance of getting a tail is 30 %, what is the probability of:

19. Getting 4 tails?

20. Getting less than 3 tails?

21. Getting 4 or less tails?

22. Getting 3 or more tails?

23. Getting more than 4 tails?

Questions 24-25: Using the standard normal distribution table, find the following:

24. The area under the standard normal curve above Z of 1.54?

25. The area under the standard normal curve between a Z of -1.90 and + 1.90?