1. A drug trial yielded the following results.

	Drug	Placebo
Headache	15	65
No Headache	17	4

Show your work, including probability notation, for calculating the probability values requested below.

a. If one subject is randomly selected, find the probability of getting a subject that had a headache or was on the drug.

The probability, rounded to three decimal places, is____________ .

b. Find the probability of selecting a subject who was on the drug, given that we know they did not have a headache.

The probability, rounded to three decimal places, is_____________ .

c. Is it possible to select a subject that has a headache and doesn't have a headache? (Type Y for yes and N for no.)

d. How do we classify the events in part c: 1. mutually exclusive or 2. not mutually exclusive? (Type either 1 or 2.)

e. Find the probability of selecting a subject that has a headache and doesn't have a headache.

The probability, rounded to three decimal places, is_______________ .

f. Is this table an example of: 1. inferential statistics or 2. descriptive statistics? (Type either 1 or 2.)

2. A small company of 22 employees needs to choose 3 people to plan their annual holiday party. Each person will take a specific role in the planning committee based on the order in which they are chosen.

How many possible groups of 3 employees are there?