Posted by jack on Thursday, December 27, 2012 at 7:27pm.
waiting times for 64 randomly selected walkin customers and determined that their mean waiting time was 15 minutes. Assume that the population standard deviation is 4 minutes. The 90% confidence interval for the population mean of waiting times is

c  ad, Saturday, December 26, 2015 at 9:46am
19

c  ad, Saturday, December 26, 2015 at 9:47am
15
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