Find the level of confidence assigned to an interval estimate of the mean formed using the following intervals. (Round your answers to four decimal places.) (a) x – 0.99.0 x to x + 0.99-o y (b) x -...

Extracted text: Find the level of confidence assigned to an interval estimate of the mean formed using the following intervals. (Round your answers to four decimal places.) (a) x – 0.99.0 x to x + 0.99-o y (b) x - 1.68.0 to x + 1.68-0 (c) x - 2.3-0, to x + 2.3•0 (d) x - 2.7.0 to x + 2.7-0