The manager of Liberty Financial Services believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, the manager gathered the following sample information. See Data Set 2.

Number of Client Contacts	Value of Sales (in Thousands)
14	24
12	18
20	28
16	30
46	70
23	30
48	78
50	70
55	85
50	83

The X column indicates the number of client contacts last month, and the Y column shows the value of sales ($ thousands) last month.

1. Determine the regression equation
2. Predict the sales if 48 contacts are made.
3. Interpret the regression equation.
4. Determine the coefficient of correlation and interpret.