Posted by **Kay** on Friday, July 29, 2011 at 2:17pm.

Can you help me with this statistics problem?

A company requires all employees to take drug test. The company can afford only the inexpensive drug test- the one with a 5% false-positive rate and a 10% false-negative rate. (This means that 5% of those who aren't using drugs test positive incorrectly and 10% of those who are using drugs test negative). Suppose that 10% of the employees in the company are using drugs and answer the following questions.

a. If one employee is chosen at random what is the probability that the employee uses drugs and tests positive?

b. If one employee is chosen at random, what is the probability that the employee does not use drugs but tests positive anyway.

c. If one employee is chosen at random, what is the probability that the employee tests positive.

d. If we know that a randomly chosen employee has tested positive, what is the probability that he uses drugs.

Please explain how to determine the probabilities.

## Answer This Question

## Related Questions

- statistics - Use the following scenario to answer the next 5 questions. Millions...
- Math (Finite) - A test for a certain drug produces a false negative 5% of the ...
- Probability - I would really appreciate if someone could help me out. A test for...
- statistics - A false positive rate of 5% is considered to be a conservative ...
- Probability - Suppose the prevalence of people with certain cancer in a give ...
- statistics - It is known that 10 % of a school's athlete population uses drugs...
- statics multiplication rule - HELP PLEASE!!! Subject uses drug 44 (True ...
- statics multiplication rule - Subject uses drug 44 (True Positive), 6(False ...
- Statistics - A research article reports the results of a drug test. This ...
- Statistics - True or False Question. I need help please. A sientific paper ...

More Related Questions