Assume the population proportion is p = .25.

1. Calculate () with a sample size of 1,200 flights (to 4 decimals).

2. What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 1,200 is selected (to 4 decimals)?

3. What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 600 is selected (to 4 decimals)?

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