1. A summary measure that is computed from a sample to describe a characteristic of the population is called
2. a parameter
3. a population
4. a statistic
5. a parameter or a population, it really does not matter.

2. Which of the following variables is best described as being quantitative, continuous measured on the ratio scale?

a. number of breads on the supermarket shelf each day

b. types of cleaning agent used in hotel

c. weight of toddlers at a nursery

d. temperature of rooms at a hotel

3.The best type of chart for comparing two sets of categorical data is:

1. a line graph
2. a pie chart
3. a bar chart
4. a histogram

4.If events A and B are independent and P(A) = 0.5, P(B) = 0.4, then the P(A n B) = ?

a. 0.50

b.0.20

c.0.90

d.0.70

5.If events A and B are mutually exclusive, and P(A) = 0.5, P(B) = 0.4, then the P(A n B) = ?

a.0.50

b.0.20

c.0.90

d. 0

6.The number of calls coming in to an office follows a Poisson distribution with mean 5 calls per hour. The probability that there will be exactly 7 calls within the next three hours is

a.0.071

b.0.010

c.0.104

d.0.090

7.If number of calls coming in to an office follows a Poisson distribution with mean 4 calls per hour. Then the variance for the number of calls within an hour is

a.4

b.2

c.0.32

d. 0.83

8. The volume of detergent manufactured by a certain company is an example of :

a.a continuous random variable

b. a discrete random variable

c. a qualitative variable

d.a nominal variable

9. Which of the following statements is TRUE?

a. The probability of the union of two mutually exclusive events A and B is P(A B) = 0.

b. If events A and B are independent and P(A) = 0.90 and P(B/A) = 0.50, then P(A B) = 0.45.

c. Assume that A and B are independent events with P(A) = 0.30 and P(B) = 0.50. The probability that both events will occur simultaneously is 0.80.

d. If events A and B have non-zero probabilities, then they can be both independent and mutually exclusive.

10. If P(A) = 0.84, P(B) = 0.76 and P(A B) = 0.60, then P(A B) is:

a.0.06

b. 0.70

c. 1.00

d. 0.14

Questions 11 and 12 are based on the following information:

An insurance company has collected the data given in Table 1, showing gender and marital status of 300 customers.

Table 1: Marital Status

Gender	Single Married Divorced
Male Female	25 125 30 50 50 20

11.Suppose that a customer is selected at random, what is the probability that the customer selected is a divorced?

a.0.1667.

b.0.0667

c.0.4000

d.0.5000

12. Suppose that a customer is selected at random, what is the probability that the customer selected is a male given he is married?

a.0.7143

b.0.5000

c.0.5833

d. 0.7667

13.Two events are said to be independent if:

a. P(A B) = P(A) + P(B)

b. P(A/B) = P(B) - P(A)

c.P(B/A) = P(A)

d.P(A B) = P(A) * P(B)

14. If A and B are mutually exclusive events with P(A) = 0.30 and P(B) = 0.60, the P(A U B) is:

a.0.00

b. 0.10

c.0.18

d.0.90

15. The variance of a binomial distribution for which n = 100 and p = 0.20 is:

1. 100
2. 80
3. 20
4. 16