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A random sample of 42 taxpayers claimed an average of $9,579 in medical expenses for the year. Assume the population standard deviation for these deductions

A random sample of 42 taxpayers claimed an average of $9,579

in medical expenses for the year. Assume the population standard deviation for these deductions was $2,386.

Construct confidence intervals to estimate the average deduction for the population with the levels of significance shown below.

1%

2%

5%

level of significance has a lower limit of

and an upper limit of

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