it Wednesday random sample of 24 students were surveyed to f

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

Solution

Confidence Interval
CI = x