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| PAGE: 702 | SET: Exercises | PROBLEM: 1 |
The total number of residents are 
.
The average commuting time to work is 
.
The standard deviation is 
.
Find the maximum error of estimate for a 
confidence level.
In a 
confidence interval, 
of the area lies in tail.
The corresponding 
value is 
.
Formula for maximumu error estimate is 
.
.
Find the confidence interval.
The confidence interval CI for a population mean 
is 
.
Substitute 
and 
.
.
.
The confidence interval is 
.
.
The confidence interval is 
.
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