A teacher gives a third grade class of n = 16 a reading skills test at the beginning of the school year.  To evaluate the changes that occur during the year, students are tested again at the end of the year.  Their test scores revealed an average improvement of MD = 4.7 points with SS = 2160. Are the test scores at the end of the year significantly higher than the test scores at the beginning of the year. Perform a hypothesis test using repeated-measures t-test. Use a one-tailed test with α = .01. T statistics= 1.57 critical t value=2.602   Construct a 99% confidence interval to estimate the average improvement for the population of third graders. Low and Upper boundary

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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.