Cheryl Stake is concerned that too many forms are being filled out incorrectly. She feels that about 8 percent of all the forms have an error.
a. How large a sample size should Ms. Stake use to be 99-percent certain she will be within 0.02?
b. Suppose Ms. Stake will accept a confidence level of 90 percent that she will be within 0.02. What will the sample size of forms be now?
c. Explain the difference between parts a and b in words.
d. Suppose Ms. Stake will accept a confidence level of 95 percent that she will be within 0.02. What will the sample size of forms be now?
a.
b.
c. The difference between the large sample size in part a and the smaller sample size in part b is due to the fact that Ms. Stake is only 90 percent certain that she will be within .02 for the acceptable interval estimate in part b, rather than 99 percent certain.
d.
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