SOLUTION: A clothing store manager takes a random sample of 40 sales for the day. From this sample the manager calculated that the mean sale amount per customer was $88 with a standard devia
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Question 1121356: A clothing store manager takes a random sample of 40 sales for the day. From this sample the manager calculated that the mean sale amount per customer was $88 with a standard deviation of $12. Assume that sales per customer is approximately normally distributed. Construct a 99% confidence interval for the mean sales per customer.
$82. 90 to $93.10
$79.50 to $95. 60
$82.00 to $94.00
$76.00 to $100.00
You can put this solution on YOUR website! This is a t-interval and 99% with df=39 is 2.708
the half interval is +/- t*s/sqrt (n)=2.708*12/sqrt(40)
That is 5.14
interval is (82.86, 93.14) , the first choice
