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1. The proportion of visitors to the Grand Canyon National Park who are foreigners is π = 0.44. In the sampling distribution of the proportion for samples of size n = 680 visitors, the margin of error for the interval that contains the middle 95% of proportions is, MOE = _______.
a. 0.048b. 0.045c. 0.041d. 0.037
2. In the previous question, to obtain a sampling distribution of the proportion, where 95% of the sample proportions fall within a margin of error of MOE = ±0.03 (3 percentage points) from π, the proper sample size is
a. 1052b. 1104c. 1168d. 1214
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