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2.3 Measures of Central Tendency

2.3 Measures of Central Tendency. I. Mean, Median, and Mode. Measure of Central Tendency : a value that represents a typical, or central, entry of a data set Mean : sum of the entries # of entries Population: Sample: Pg 60 TIY #1. Median:

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2.3 Measures of Central Tendency

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  1. 2.3 Measures of Central Tendency

  2. I. Mean, Median, and Mode • Measure of Central Tendency: a value that represents a typical, or central, entry of a data set • Mean: sum of the entries # of entries Population: Sample: • Pg 60 TIY #1

  3. Median: the value that lies in the middle when the data is ordered • Pg 61 TIY#2 & 3

  4. Mode: data entry that occurs with the most frequency (no mode, bimodal, multimodal) • Pg 62 TIY #4 & 5

  5. Outlier: data entry far removed from the others • If data has an outlier use the median not the mean as the best measure of central tendency • Pg 63 TIY#6

  6. II. Weighted Mean & the Mean of Grouped Data • Weighted Mean: the mean of a data set whose entries have varying weights w = weight of each entry x

  7. Page 64 TIY #7

  8. Mean of a Frequency Distribution: • Guidelines: 1) Find the midpoint of each class 2) Find the sums of the midpoints multiplied by the frequencies 3) Find the sum of the frequencies 4) Divide #2 by #3.

  9. Page 65 TIY #8

  10. Homework • PAGES 68 – 73 • #16, 22, 30, 32, 40, 42, 44, 46

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