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All 423 Wisconsin public schools were all given a rating by the Wisconsin Department of Public ...

All 423 Wisconsin public schools were all given a rating by the Wisconsin Department of Public Instruction based on several variables. The mean rating reported was 71.5 and the standard deviation was 4.87. To do a follow-up study a random sample of 40 schools was selected. In this sample, the mean rating was 70.9. One of the researchers is alarmed, thinking the report may have been mistaken. Do you think this sample result is unusually low? Explain.

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Stats: Modeling the World

Edition: 4^th

Authors: Bock, Velleman, De Veaux

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