4. To determine the average cost of running for a congressional seat, of 50 politicians is chosen and the politicians' records examined. The cost figures show a mean of $1,825,000 with a standard deviation of $132,000. Which of the following is the best interpretation of a 90% confidence interval estimate for the average cost of running for office ? (A) Of all politicians running for a congressional seat, 90% spend between $1,794,000 and $1,856,000. (B) Of all politicians running for a congressional seat, 90% spend a mean dollar amount that is between $1,794,000 and $1,856,000. (C) We are 90% confident that politicians running for a congressional seat spend between $1,794,000 and $1,856,000. (D) We are 90% confident that politicians running for a congressional seat spend a mean dollar amount between $1,794,000 and $1,856,000. (E) We are 90% confident that in the chosen sample, the mean dollar amount spent running for a congressional seat is between $1,794,000 and $1,856,000. ​