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The high cost of health care is a matter of major concern for a large number...

The high cost of health care is a matter of major concern for a large number of families. A random sample of 25 families selected from an area showed that they spend an average of $253 per month on health care with a standard deviation of $47. Assume that the montly health care expenditure of all families in this area have a normal distribution.
construct a 98% confidence interval for the mean health care expenditure per month incurred by all families in this area
Math   Statistics-And-Probability   
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