The school board is trying to evaluate a new mathprogram introduced to second-graders in five elementary schoolsacross the county this year. A sample of the student scores on standardized math tests in each elementary school yielded the fol-lowing data: SCHOOL NO. OF TEST ERRORSA 52B 27C 35D 44E 55 Construct a c -chart for test errors, and set the control limitsto contain 99.73% of the random variation in test scores.What does the chart tell you? Has the new math program beenCorbis Super RF/Alamyeffective?

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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.