Online Educational Journals

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Summary: The box and whiskers on each plot indicate the 5th 25th 50th 75th and 95th percentiles for each group of students They are plotted against the percentiles of the national norm group Notice first that for the CPMP Pretest these five percentiles are within two to four percentile points of those of the nationally representative norm group at the beginning of ninth grade

Image Dimensions: 600 x 399