# Statistics

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Tony's Pizza guarantees all pizza deliveries within 30 minutes of the placement of orders. An agency wants to estimate the proportion of all pizzas delivered within 30 minutes by Tony's. What is the most conservative estimate of the sample size that would limit the margin of error to within .02 of the population proportion for a 99% confidence interval?

• Statistics -

4065

• Statistics -

This is not correct

• Statistics -

Margin of error = 0.02
z = 2.58

Unknown p
We are going use 50%

n = (za/2 /E ) ^2 *p(1-p)

n = (2.58/0.02)^2*.5* .5 = 4160.25
n = 4161

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