1. This graph shows the relationship between the numbers of policemen (x) and crimes committed per hour in Rio de Janeiro (y). What is the equation of this graph?

a. y = 3 - 0.5x

b. y = 3 + 0.5x

c. y = 2 - 0.5x

d. y = 4 + 0.6x

e. Not sure

2. A rating system being proposed to measure the financial health of a nonprofit has a total of 20 questions worth 100 points. The questionnaire consists of two parts: Yes/No questions worth 3 points each, and longer questions worth 11 points each. How many longer questions are on the rating system?

a. 8

b. 5

c. 15

d. 4

e. Not sure

3. The benefit of a military training program is: Y= -0.5X^{2}+7X+4, where X is the duration of the program in months. What is the optimum length of the program?

a. x = 7

b. x = 14

c. x = 4

d. x = 57/2

e. Not sure

4. Look at cars.csv. What is the mean travel time? (Round to one decimal place. You can use whatever software you want to figure this out: excel or STATA).