Posted by **paula** on Sunday, March 17, 2013 at 10:29pm.

a pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. how large should the sample be if she wishes to be accurate to within $0.15? a previous study showed that the standard deviation of the price was $0.26

- statistics -
**MathGuru**, Monday, March 18, 2013 at 8:08pm
Use a formula to find sample size.

Here is one:

n = [(z-value * sd)/E]^2

...where n = sample size, z-value = 1.96 for 95% confidence, sd = 0.26, E = 0.15, ^2 means squared, and * means to multiply.

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

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