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April 1, 2015

April 1, 2015

Posted by **Megan** on Sunday, May 5, 2013 at 5:51pm.

A: A 99% confidence level requires ___ subjects

B: A 90% confidence level requires ___ subjects

- 7 STATS MATHGURU PLEASE HELP -
**MathGuru**, Sunday, May 5, 2013 at 6:07pm2.58 = 99% confidence interval

1.645 = 90% confidence interval

Use a formula to find sample size.

Here is one:

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

...where n = sample size, z-value = values above for the intervals needed, sd = 17.8, E = .02, ^2 means squared, and * means to multiply.

Plug the values into the formula and finish the calculations. Round your answers to the next highest whole number.

I'll let you take it from here.

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