Regression was used to estimate sales revenue ($/week) from number of customers: You are given the following linear relationship:

Estimated Sales Revenue = 30+78 Customers

Which of the following is the correct interpretation of the slope?

1.Estimate sales revenue increases by an average $78, for each extra customer.

2.Estimate sales revenue increases by an average of $30, for each extra customer.

3.Estimate sales revenue decreases by an average of $30, for each extra customer.

4.Estimate sales revenue decreases by an average $78, for each extra customer.

5.Estimate sales revenue increases by an average $108, for each extra customer.