Chapter 9.1, Problem 13P

(a)

To determine

Draw a scatter plot and the line that best fits the data.

(b)

To determine

Identify whether the correlation is low, moderate, or strong.

Identify whether the direction of correlation is positive or negative.

(c)

To determine

Verify the values of ${\displaystyle \sum x}$, ${\displaystyle \sum x^2}$, ${\displaystyle \sum y}$, ${\displaystyle \sum y^2}$ and ${\displaystyle \sum xy}$ using the calculator.

Find the value of r.

Explain whether y should tend to increase or decrease, as x increases from 3 to 24 months based on value of r.