One important thing that the government looks at when allowing funds for financial aid is the proportion of students that would graduate with a bachelor's degree in 4 years or less, (15 units per semester) Find the sample size needed to estimate that proportion. For this problem use a confidence level of 90% and a margin of error of 2% i) find the sample sie when nothing is known about the percentage to be estimated. ii) Now find the sample size assuming studies have shown that 45% of all students earn their degrees in four years.

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A: Solution

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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.