The manager of the Inlet Square Mall, near Ft. Myers, Florida, wants to estimate the mean...
The manager of the Inlet Square Mall, near Ft. Myers, Florida, wants to estimate the mean amount spent per shopping visit by customers. A sample of 20 customers had a sample mean of $49.35 and a sample standard deviation of $9.01. Find the 95% confidence interval for the population mean.
Homework Answers
Confidence interval, CI = 
Z*
=
$49.35
s = $9.01
n = 20
For 95% confidence level, Z* = 1.96
Confidence interval = 49.35 1.96x
= 49.35 3.95
= (45.40, 53.30)
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