the high cost of health care is matter of major concern for a large number of families a random

Step 1: Calculate the critical value using the t-distribution table for a 95% confidence level a

Question

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 $271 per month on health care with a standard deviation of $48. Make a 95% confidence interval for the mean health care expenditure per month incurred by all families in this area. Assume that the monthly health care expenditures of all families in this area have a normal distribution. Note 1: Your confidence interval should be given in the format of (a, b) where a and b are two numbers. Note 2: Keep decimal places in your answer for the confidence interval.

          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 $271 per month on health care with a standard deviation of $48. Make a 95% confidence interval for the mean health care expenditure per month incurred by all families in this area. Assume that the monthly health care expenditures of all families in this area have a normal distribution.

Note 1: Your confidence interval should be given in the format of (a, b) where a and b are two numbers.
Note 2: Keep decimal places in your answer for the confidence interval.

Added by Daniel S.

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