In December 2001 the research firm GfK surveyed babyboomers (Americans born between 1946 and 1964)with $100,000 or more investable assets. GfK contacted1006 randomly selected baby boomers by cell phoneor landline. The vast majority, 71%, reported that theyhave provided support to their adult children in the formof helping them pay for college tuition or loans. GfKreported a margin of error of plus or minus 3%. Whatconfidence level were the pollsters using?Source: New York Times, May 5, 2012.A) 90% B) 95% C) 96%D) 98% E) 99%

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.