Question

The scatter plot shows the number of households, in millions, that have cable television over eight consecutive years.

image of a scatter plot with x axis labeled Time in Years and y axis labeled Number of Households, with points at 1 comma 3 and 8 tenths, 2 comma 5 and 8 tenths, 3 comma 6 and 2 tenths, 4 comma 7 and 5 tenths, 5 comma 7 and 2 tenths, 6 comma 8 and 3 tenths, 7 comma 9 and 3 tenths, and 8 comma 8 and 5 tenths.

Predict the number of households with cable television in year 12.

8.9 million
9.7 million
12.1 million
14.5 million

Answer 1

Plot the points on the graphing calculator. Then generate a linear regression model.

f(x) = .6714x + 4.0536

Substituting 12 for x:

f(12) = about 12.1 million