The alternating current (AC) breakdown voltage of an insulating liquid indicates

Question

The alternating current (AC) breakdown voltage of an insulating liquid indicates its dielectric strength. An article gave the accompanying sample observations on breakdown voltage (kV) of a particular circuit under certain conditions. 62 51 54 58 42 53 55 61 59 64 50 54 64 62 51 68 54 56 58 50 55 51 57 56 46 56 53 54 52 48 48 55 57 49 63 58 57 56 53 59 54 53 50 56 60 50 56 58 (a) Construct a boxplot of the data. 40 45 50 60 65 70 40 45 70 o40 45 65 70 40 45 50 65 70 (b) Calculate and interpret a 95% CI for true average breakdown voltage -(Round your answers to one decimal place.) 5371 , 56.54 ) Interpret the resulting interval We are 95% confident that this interval does not contain the true population mean. we are 95% confident that the true population mean lies below this interval we are 95% confident that this interval contains the We are 95% confident that the true population mean lies above this interval true population mean. Does it appear that has been precisely estimated? Explain.

Explanation / Answer

for last question:

margin of error E =0.5

for 95% CI ; crtiical z =1.96

as approximate std deviaiton =(range/4) =(70-40)/4 =7.5

therefore sample size n=(z*std deviaiton/E)2 =~865

please revert on this

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