M119L05-page10 - We've processed the numerator before...

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(Lesson 5: Measures of Center; 3-2) 3.10 This scheme does not automatically bias our estimate towards either the low end or the high end. Score Classes Frequency f () Class Marks x () 50-59 2 54.5 60-69 4 64.5 70-79 7 74.5 80-89 10 84.5 90-99 5 94.5 N = f ± = 28 Estimated Mean = Estimated Sum N = f ± x ² N = 2 () 54.5 () + 4 () 64.5 () + 7 () 74.5 () + 10 () 84.5 () + 5 () 94.5 () 28 = 2206 28
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Unformatted text preview: We've processed the numerator before dividing. ( ) 78.8 points (indicates end of solution) Think About It : If we had used 55, 65, etc. as our class marks, how would our estimate have changed? Think About It : Why is our estimated mean closer to the 90s than to the 50s? A related issue is coming up ....
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This note was uploaded on 12/29/2011 for the course MATH 119 taught by Professor Kim during the Fall '09 term at SUNY Stony Brook.

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