A medical researcher wants to construct a

99%

confidence interval for the proportion of knee replacement surgeries that result in complications.

Part 1 of 2

(a) An article in a medical journal suggested that approximately

13%

of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of

0.07

?

A sample of 3 operations is needed to obtain a 99% confidence interval with a margin of error of 0.07 using the estimate 0.13 for p .

Part:1 / 2

1 of 2 Parts Complete

Part 2 of 2

(b) Estimate the sample size needed if no estimate of

p

is available.

A sample of operations is needed to obtain a 99% confidence interval with a margin of error of 0.07 when no estimate of p is available.