2. Twelve measurements are made of a certain pressure. The readings are given below. Determine a 95% confidence interval on the true temperature (i.e., on the mean of the data set). Repeat for a l 0% confidence interval. P (psig) 494.4 502.0 498.2 498.1 496.6 503.9 506.0 501.4 506.5 493.8 504.9 492.9