Question

X Incorrect. In Applied Life Data Analysis (Wiley, 1982), Wayne Nelson presents the breakdown time of an insulating fluid between electrodes at 34kV. The times, in minutes, are as follows: 0.22, 0.73, 0.94, 1.33, 2.89, 3.30, 4.29, 4.61, 4.81, 6.54, 7.36, 8.06, 8.38, 12.01, 31.98, 32.44, 33.77, 36.10, and 72.09. Calculate the sample mean and sample deviation of the breakdown data. Round your answers to 2 decimal places. Mean = || 14.27 minutes X Standard Deviation = T18.73 minutes

Answer 1

sample mean $\bar{x}$ = $\sum$ X / n

= 271.85 / 19

= 14.31

Sample standard deviation = sqrt [ $\sum$ X² - n$\bar{x}$² / n-1 ]

= sqrt [ 10177.3025 - 19 * 14.31² / 18 ]

= 18.69