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January 31, 2015

January 31, 2015

Posted by **Blerp** on Friday, November 16, 2012 at 11:35am.

7

44

8

62

87

- Statistics -
**MathGuru**, Friday, November 16, 2012 at 7:15pmFormula:

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

...where n = sample size, z-value will be found using a z-table to represent the 90% confidence interval, sd = 40, E = 10, ^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.

- Statistics -
**Anonymous**, Sunday, March 30, 2014 at 3:09pm44

**Answer this Question**

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