Dee Fektiv is concerned that too many forms are being filled out incorrectly. She feels that about 10 percent of forms have an error.

a. How large a sample size should Dee use to be 99% certain that she will be within 0.02? Show your calculations.

b. Suppose Dee will accept a confidence level of 95 percent that she will be within 0.02. what will the sample size of the forms be now?

Show your calculations.