Mathematics, 02.03.2020 20:10 rainyfallaw

The mayor of Statville has to decide how to allocate her education budget between the two high schools in town, "Stat Sticks" and "Datum High." To decide which school deserves a bigger portion of the budget, she went over the grade sheets of the students from both schools in the past 5years, and analyzed the data. What type of a statistical study did the mayor use?
a. Sample study
b. Experiment
c. Observational study

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