Question: Formula 8.2 provides a method for computing the sample size required to obtain a confidence interval with a specified confidence level and margin of error.

Formula 8.2 provides a method for computing the sample size required to obtain a confidence interval with a specified confidence level and margin of error. The number resulting from the formula should be rounded up to the nearest whole number.

a. Why do we want a whole number?

b. Why do we round up instead of down?

Formula 8.2

The sample size required for a (1 − α)-level confidence interval for μ with a specified margin of error, E, is given by the formula = (0/12 - 0) E n=

= (0/12 - 0) E n=

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