# Tampa University Statistics Questions

fars (-)False &

neg

157

3

24

Chapter 4

8. Use these results from the “1-Panel THC” test for marijuana use: Among 143

subjects with positive test results, there are 24 false positives; among 157

negative results, there are 3 false negative results. (Hint: you may want to

construct a table like Table 4-1 in the text). (12 points)

a. How many subjects are included in the study?

143

b. How many of the subjects had a true negative result?

157

C. What is the probability that a randomly selected subject had a true

negative result?

d. If one of the test subjects is randomly selected, what is the probability that

the subject tested negative OR used marijuana?

e. If one of the test subjects is randomly selected, what is the probability that

the subject tested positive OR did not use marijuana?

f. If one of the test subjects is randomly selected, what is the probability that

the subject did not use marijuana?

a

9. With a short time remaining in the day, a Fed Ex driver has time to make

deliveries at 6 locations among the 9 locations remaining. How many different

routes are possible? (5 points)

10. Determine the number of different ways the letters of MISSISSIPPI can be

arranged. (5 points)

CONS

וכך

OIS

Chapter 5

11. Assume that when adults with smartphones are randomly selected, 54% use

them in meetings or classes. If 20 adult smartphone users are randomly

selected, find the probability that exactly 15 of them use their smartphones in

meetings or classes. (5 points)

12. Assume that when adults with smartphones are randomly selected, 54% use

them in meetings or classes. If 12 adult smartphone users are randomly

selected, find the probability that fewer than 3 of them use their smartphones in

meetings or classes. (5 points)

Chapter 6

13. A bone mineral density test is used to identify a bone disease. The result of a

bone density test is commonly measured as a z-score, and the population of

Z-scores is normally distributed with a mean of O and a standard deviation of 1. (7

points)

a. For a randomly selected subject, find the probability of a bone density test

score less than 1.54.

b. For a randomly selected subject, find the probability of a bone density test

score greater than -1.54.

a

C. For a randomly selected subject, find the probability of a bone density test

score between -1.33 and 2.33.

70-389

390-469