Find the level of confidence assigned to an interval estimat

Find the level of confidence assigned to an interval estimate of the mean formed using the following intervals. (Give your answers correct to three decimal places.)

(a) x - 0.95·_x to x + 0.95·_x

(b) x - 1.68·_x to x + 1.68·_x

(c) x - 2.22·_x to x + 2.22·_x

(d) x - 2.54·_x to x + 2.54·_x

Solution

(b) x - 1.68· x to x + 1.68· x

confidence interval:98%

(d) x - 2.54· x to x + 2.54· x

confidence interval: 98.5%