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# Ch2.7 Data Measures of Central Tendency

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### Ch2.7 Data Measures of Central Tendency

1. 1. Ch2.7_DataMeasuresCentralTendency.notebook September 19, 2011 Warm Up y 6 Graph 5 4 3 y < x ­ 4 ­6 ­5 ­4 ­3 ­2 ­1 2 1 0 1 2 3 4 5 6 x ­1 ­2 ­3 ­4 ­5 ­6 Chapter 2.7 Data and Measures of Central Tendency 1
2. 2. Ch2.7_DataMeasuresCentralTendency.notebook September 19, 2011 Vocab Statistics ­ the study of data Population ­ large (huuuuuuuuge) group of data Sample ­ smaller group from the population Frequency Table A way to compile and organize data   # of pets   Frequency   at home   0   1   2   3 or more 2
3. 3. Ch2.7_DataMeasuresCentralTendency.notebook September 19, 2011 Fill in the Frequency Table with the  the given test scores in red   Score Interval   Frequency 90 83 68   90 ­ 100 34 85 76   80 ­ 89 79 89 80   70 ­ 79 77 59 91 81 72 64   60 ­ 69 98 96 62   50 ­ 59   49 or lower Measures of Central Tendency Mean ­ average of data Median ­ middle number (when arranged in order) Mode ­ most frequent value 3
4. 4. Ch2.7_DataMeasuresCentralTendency.notebook September 19, 2011 Example Find the mean, median, and mode of the following fourteen  numbers 4, 6, 2, 8, 9, 4, 6, 4, 5, 7, 5, 8, 3, 2 Mean (average) =    Sum of numbers               14 Median (middle #) =  2, 2, 3, 4, 4, 4, 5, 5, 6, 6, 7, 8, 8, 9 Mode (most common) =  Example Find the mean, median, and mode of the following ACT scores 22, 28, 30, 27, 25, 31, 25, 26, 19 Mean (average) =  Median (middle #) =  Mode (most common) =  4
5. 5. Ch2.7_DataMeasuresCentralTendency.notebook September 19, 2011 Page 84 1 ­ 14 all 5