# statistics

A test has a mean of 104 and a standard deviation of 16. We want to be 98% certain that we are within 4 points of the true mean. Determine the sample size.

1. 0
2. 1
1. Use a formula to find sample size.

Here is one:
n = [(z-value * sd)/E]^2
...where n = sample size, z-value will be found using a z-table to represent the 98% confidence interval, sd = 16, E = 4, ^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.

Hope this helps.

posted by MathGuru
2. 87

posted by Toni

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