Mr. Martin’s best reading group achieved the following scores on an achievement test: 85, 90, 90, 92, 94, 94, 97, 97, and 98. Mr. Scott’s best reading group obtained the following scores on the same achievement test: 61, 85, 90, 90, 92, 93, 94, 97, 97, and 97.
For each group, determine the following:
N
R
X bar, or mean
MDN
Mode
Why is there so much difference in the means?
What measure of central tendency should be used to compare these distributions?
sources to be used:
Popham, W. J., & Popham, J. W. (2005). Classroom assessment: What teachers need to know. Pearson/Allyn and Bacon.
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