8.12 B/ use normal distribution only grouped data were collecsed in units of 100

Question

8.12 B/ use normal distribution only grouped data were collecsed in units of 1000 he ric plot of the reliability and of the cumulative hara Exercise 89 is run to completion. The remaining function versus time. test sta 100.6, 117.9, 124.8, 148.7, 1595, 2052, and 232 5 hourS the lognormal parameters and the MTT the numbers of bends to failure were recorded for 20 paper the analysis and compare the Redo the Kee alues obtained in Exercise 89 follown 15, 90, 19, 11., 12,9, 9,8, 15, 20, 11., 22, 20,9, 25, 9. 11 o fit your data to Weibull, lognormal and/or normal distri Esercise 8.9 but fit the data to a two-parameter Weilbull distri h lips 11, 29, 15, (a 20, 19, 1 KIt The ) Make a nonparametric plot of R(t), the butions and determine the (c) Bricfly discuss your results. 14 Consider the genera multiply censored data for the field windings tors. The times to failure and removal times (in months) for l0 g eo 9 57.5, 65.0+, 65.8, 70.0, 75.0+, 75.0+, 875+,88.3+ 1.7, 39.2, 57.5 942+, 101.7+,105.8, 109.2+,110.0, and 130.0+. Make a plot of the reliability. 815 Suppose that a device undergoing accelerated testing can be described by a Weibull distribution with a shape factor of m 2.0. Under acceler- ated test conditions, with an acceleration factor of 50, 50% of the devices are found to fail during the first month. Under normal operating onditions, estimate how long the device will last before the failure proba bility reaches 10%. (This is referred to as the life of the device. Fire Nelkon, Applind Life Data Anatsis, Wiley, New York, 1982

Explanation / Answer

There are two parameters of normal distribution : Mean and Standard Deviation

In the sample the mean is 15.15 and standard deviation is 6.115

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