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April 18, 2014

April 18, 2014

Posted by **Shavela** on Saturday, April 21, 2012 at 2:43am.

- Statistics -
**MathGuru**, Saturday, April 21, 2012 at 11:18amUse formulas to find sample size.

For the first part:

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

...where n = sample size, z-value will be 1.96 using a z-table to represent the 95% confidence interval, sd = 68, E = 15, ^2 means squared, and * means to multiply.

For the second part:

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

... where n = sample size, z-value is 1.96, p = .5 (when no value is stated in the problem), q = 1 - p, ^2 means squared, * means to multiply, and E = .05 (for 5%).

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

Hope this helps.

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