In the population of employees in your company, 35 percent contribute to the annual United Way campaign. You plan to take a sample of size n = 200 and calculate the sample proportion who contribute to United Way.

The Expected proportion will be 0.35 (corresponding to the percentage of 35% )

In full : the actual number who contribute = 35% of 200 = 70

Proportion who contribute = 70/ 200 = 0.35

E (p) = 0.35

Note that this p has a binomial distribution with expected value 0.35

=

answer Sqr [( 0.35 X 0.65)/200]

The standard error works out at 0.03327

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