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. 0.048
b. 0.045
c. 0.041
d. 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. 1052
b. 1104
c. 1168
d. 1214