Nationally, 83% of Americans have earned a high school diploma.  We want to see if the proportion of Pennsylvania high school students who have a high school diploma is greater than 83%.  Suppose a representative sample of 225 Pennsylvanians is taken and each is asked if they have earned a high school diploma. The same survey also tested if more than 30% of Pennsylvanians had earned a Bachelor's degree.  In testing these hypotheses, the p-value was found to be 0.1711.  Which of the following could be the confidence interval for the population proportion of Pennsylvanians with a Bachelor's degree? Select one: a. (0.16, 0.28) b. (0.28, 0.32) c. (0.27, 0.39) d. (0.35, 0.45) e. (0.31, 0.38)

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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.