oooo Verizon LTE 4:26 PM gmc.mrooms3.net 1796D Question 13 Not yet answered Mark

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oooo Verizon LTE 4:26 PM gmc.mrooms3.net 1796D Question 13 Not yet answered Marked out of 1.00 Flag question Provide an appropriate response In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. How large a sample must he select if he wants to be 99% confident that the true average time is within 15 minutes of the sample average? Assume the standard deviation of all times is 30 minutes Select one: B. 26 C.27 D. 6 Previous page Next page

Explanation / Answer

option C

for 99 % CI value of z= 2.5758 standard deviation = 30 margin of error E = 15 required sample size n=(z/E)2                                         = 27

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