Downloaded from https://www.everyspec.com AMCP 706.198 XMIPD1L No. For Data Set A (Table 2-3) find the sample mean and sample standard deviation. Estimate u and a, and find suitable r-confidence limits for each. Procedure 1. Calculate the sample mean by Eq. 1, - 1950.7 hr 2-32. Estimate p . = 1951 hr. 2. Calculate the eample standard de- 2. & - 859. 0 hr. viation by Eq. 2-33. 3. Caloulate $sby l-•q. 2-44. 3. # .u& -€/- m u hr 20 881.3 hr. 4. Find the 90%, 2-sided (symmetric) 4. t " 1. 729 for 95%, and 5% and 19 de- s-confidence limits for 1A. Use grees of freedom. Eq. 2-37 and the t tables inP Six or in Ref. 30 or elsewhere. 1 1.720 - 8-1.J/•0" pu, p L are the upper and lower limits for.
*"- x 1.729 + 1950. 7) hr = (340.7 + 1950.7)hr o 2290 hr L, *(-1. 729)+ 1950.7]hr - (-340.7 + 1950.7)hr S1610 hr. 5. Compare with the result of the 5. Graphical estimixtion: graphioal analysis in par. 2-2.3 1400 hr S A S 2440 hr, Example No. I(A) step 3. They are reasonably close. . 1920 hr. Analytic estimation: Conf{610 hr A - 2290 hr} 90% S-1951 hr. It'l .. ....