2.3 measures of central tendency. i. mean, median, and mode o measure of central tendency: a value...
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2.3 Measures of Central Tendency
I. Mean, Median, and Mode
O Measure of Central Tendency: a value that represents a typical, or central, entry of a data setO Mean: sum of the entries
# of entries Population: Sample:
O Pg 60 TIY #1
O Median: the value that lies in the middle when the data is ordered
O Pg 61 TIY#2 & 3
O Mode: data entry that occurs with the most frequency (no mode, bimodal, multimodal)
O Pg 62 TIY #4 & 5
O Outlier: data entry far removed from the others
O If data has an outlier use the median not the mean as the best measure of central tendency
O Pg 63 TIY#6
II. Weighted Mean & the Mean of Grouped Data
O Weighted Mean: the mean of a data set whose entries have varying weights
w = weight of each entry x
Page 64 TIY #7
O Mean of a Frequency Distribution:
O Guidelines:1) Find the midpoint of each
class2) Find the sums of the
midpoints multiplied by the frequencies3) Find the sum of the
frequencies4) Divide #2 by #3.
Page 65 TIY #8
HomeworkO PAGES 68 – 73 O #16, 22, 30, 32, 40, 42, 44, 46