A random sample of 43 taxpayers claimed an average of $9,883 in medical expenses for the year. Assume the population standard deviation for these deductions was $2,391. Construct confidence intervals to estimate the average deduction for the population with the levels of significance shown below.

a. 1% b. 10% c. 20%

a. The confidence interval with a 1% level of significance has a lower limit of $______ and an upper limit of $______?

b. The confidence interval with a 10% level of significance has a lower limit of $______ and an upper limit of $______?

c. The confidence interval with a 20% level of significance has a lower limit of $______ and an upper limit of $______?