Recently, the annual number of driver deaths per 100,000 for the selected age groups was as follows:

a. For each age group, pick the midpoint of the interval for the x value. (For the 75+ group, use 80.)

b. Using ?ages" as the independent variable and "Number of driver deaths per 100,000" as the dependent variable, make a scatter plot of the data.

c. Calculate the least squares (best-fit) line. Put the equation in the form of: y = a + bx

d. Find the correlation coefficient. Is it significant? e. Predict the number of deaths for ages 40 and 60.

f. Based on the given data, is there a linear relationship between age of a driver and driver fatality rate?

g. What is the slope of the least squares (best-fit) line? Interpret the slope.

Age Number of Driver Deaths per 100,000 17.5 38 22 36 29.5 24 44.5 20 64.5 18 80 28 Table 12.19