A large national bank charges local companies for using their services. A bank official reported the results of a regression analysis designed to predict thebank's charges(y), measured in dollars permonth, for services rendered to local companies. One independent variable used to predict service charge to a company is thecompany's sales revenue(x), measured in$ million. Data for 21 companies who use thebank's services were used to fit the model E(y)=0+1x.

Suppose a95% confidence interval for 1 is(15,25). Interpret the interval.

A.

We are95% confident that sales revenue(x) will increase between$15 and$25 million for every$1 increase in service charge (y).

B.

We are95% confident that service charge (y) will increase between$15 and$25 for every$1 million increase in sales revenue (x).

C.

We are95% confident that service charge (y) will decrease between$15 and$25 for every$1 million increase in sales revenue (x).

D.

We are95% confident that the mean service charge will fall between$15 and$25 per month.