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October 21, 2014

October 21, 2014

Posted by **Rachel** on Saturday, February 28, 2009 at 2:36pm.

a)225

b)325

c)425

d)525

e)625

- statistics -
**MathGuru**, Sunday, March 1, 2009 at 10:53amFormula:

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

...where n is the sample size you seek, z-value is obtained using a z-table for the confidence interval (90%) in the problem, p and q represent proportions, E is the maximum error, and ^2 means squared.

Substituting values:

n = [(1.645) * .5 * .5]/.04^2

...where 1.645 represents the 90% confidence interval, .5 represents p if no value is stated, q = 1 - p = 1 -.5 = .5, .04 is 4% in decimal form and represents the maximum error of estimate for a proportion.

Calculate and choose the closest answer. There may be differences in the answer due to methods used.

I hope this will help.

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