Exercise

Test for a difference in median test scores

The High School and Beyond survey is conducted on high school seniors by the National Center of Education Statistics. We randomly sampled 200 observations from this survey, and these data are in the hsb2 data frame (which is already loaded for you). Among other variables, this data frame contains scores on math and science scores of each sampled student.

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Add a column to hsb2 named diff containing the math scores minus the science scores.