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QUESTION
a random sample of 109 customers, who visited a department store, spent an average of $82 at this store. Suppose the standard deviation of...
a random sample of 109 customers, who visited a department store, spent an average of $82 at this store. Suppose the standard deviation of expenditures at this store is $21. The 98% confidence interval for the population mean (round to two decimal places) is:
The lower limit is $=
The upper limit is $=
