The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 310 salespeople was taken and the mean number of cars sold annually was found to be 71. Find the 94% confidence interval estimate of the population mean.
statistics - PsyDAG, Thursday, May 10, 2012 at 9:59am
94% = mean ± 1.88 SEm
SEm = SD/√n