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County officials administered a drug use survey to all junior high students in September. Based on this survey, the officials then selected the junior high
County officials administered a drug use survey to all junior high students in September. Based on this survey, the officials then selected the junior high school with the highest drug usage to receive a drug education program.; the other junior high schools were to be used as comparisons. The officials administered the same survey to all junior high students in June. First, draw the design, using Xs and Os. Second, identify the likely threats to validity of this study.
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