statistics question help me please?

Question

a researcher is interested in the amount of state and federal income generated as a result of audits performed by the IRS. in a random sample of 50 income tax returns, the amount due after an audit averaged $880.22 with a standard deviation of $210.71.

1. construct a 98% confidence interval for the true standard deviation of the amount due on an income tax return after such an audit.
2. a representative of the IRS claims that performing audits has helped to recover a significant amount of money and that the average amount due after an audit is more than $800. Test the IRS's claim at a=.02.
i tried to solve this question during 2 hours. please i need your help!!! thx a million!

Answer 1

Re-post in the math area. We don't really do much statistics calculations here...

Answer 2

The IRS are theives. Be like Fox Mulder..... trust no-one!