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aving convinced the board members that a stratified sample is the most appropriate, you collect data from the 80 schools. The spreadsheed provided contains the collected data in the tab labelled "Data." The difference between average school test scores three years ago and average school test scores today is recorded as "chgtestscores." Positive values of chgtestscores indicate an increase in test scores at the school as compared to 3 years ago, while a negative number indicates that the school is now performing worse on these tests. In addition to this variable, there are three more variables in this data set. The first is "curriculum" which can have a value of either "old" or "new," where new implies the experimental curriculum. Next is "income($000)," which represents the average annual income (in thousands of dollars) of the households of students from each school. Finally, there is a variable called "school" which is simply ID number of the elementary school. The first step to this analysis is to generate some descriptive measures. ,,b) Show the distribution of the change in test scores across all schools.

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