Question: Millions of Americans arrange their travel plans on the Web. According to an article in USA today, 77% of travelers purchase plane tickets on the Web. If you select a random sample of 200 travelers:

A) What is the probability that the sample will have between 75% and 80% purchase plant tickets on the Web?

B) The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?

C) The probability is 95% that the sample percentage will be contained within what symmetrical limits of the population percentage?

The book gives these answers to problem 2 – a-0.5926, b-0.7211 and 0.8189,

c-0.7117 and 0.8283.