it Wednesday, random sample of 24 students were surveyed to find out how long La

Question

it Wednesday, random sample of 24 students were surveyed to find out how long Last The from the Fretwell building to the new College of Education building 3.2 survey team found a sample mean of 12.3 minutes with a standard deviation of minutes. Assuming walking times from Fretwell to the College of Education are normally distributed for the populations of walkers, which of the following is a 95% confidence interval for the population mean of walking times? (a) 12.3 1645 s u s t 1.645 h 12.3 (b) 12.3 2.069 s S 12.3 2.069 (c) 12.3 2.500 s u S 12.3 2.500 (d) 12.3 2.064 su S 12.3 2.064 h (e) 12.3 1.96 s us 12.3 1.96

Explanation / Answer

Confidence Interval
CI = x

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