Answer:
And the confidence interval would be given by: (45981.81; 46650.19)
Explanation:
Data given
represent the sample mean
population mean (variable of interest)
represent the population standard deviation
n=651 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
Since the Confidence is 0.91 or 91%, the significacne is
and
, and the critical value is
Now we have everything in order to replace into formula (1):
And the confidence interval would be given by: (45981.81; 46650.19)