1. Before a team is deployed on a protective mission, the team lead receives on average eight text messages in the twelve hours before the departure. What would be the best probability distribution to compute the probability of receiving at least four text messages during that period of time?

a. binomial distribution.

b. Poisson distribution.

c. hypergeometric distribution.

d. More information is needed.

2. An investigative team lead is given basic information on 38 employees, with only 5 having extensive experience in counterfeit detection. He selects 6 of the agents as potential team members. To study his ability to recognize the best counterfeit experts, what type of probability distribution would be used?

a. binomial distribution.

b. Poisson distribution.

c. hypergeometric distribution.

d. More information is needed.

3. Safety for tourist in the National Capital Region is challenging. To ensure quality, Capital Police survey the number of pedestrians in the National Mall every 30 minutes of a 24-hour period. The results should indicate when the presence of officers is most needed. The number of pedestrians in the Mall is an example of what type of variable?

a. Categorical variable

b. Discrete variable

c. Continuous variable

d. a statistic

4. When considering histograms, what statement is FALSE?

a. Used to divide up possible values into classes.

b. Generally has bars of equal width.

c. Works well with data sets great than 100 observations.

d. Used to summarize qualitative data.

e. Has an appearance similar to a bar chart.

5. Twenty-eight pedestrians were surveyed in the National Capital Region. They were asked, "What is your gender?" (Male = M; Female = F;) and "Where are you heading?" (Home = H; Washington Memorial = WM; Jefferson Memorial = JM; White House = WH.) Which would be the best way to present the data?

a. stem-and-leaf display

b. time-series plot

c. contingency table

d. Pareto chart

e. pie chart

6. What type of probability is involved in this example? You will be given a bonus for your efforts on the job. You need to decide how to invest your money. There is some financial data on how the stock market is performing and you have some past experience with similar stocks. You predict that there is a 90% chance that you could make a profit off of these stocks.

a. A priori probability

b. Empirical probability

c. Subjective probability

d. Conditional probability

e. a statistic