Describing Quantitative Data Numerically. Symmetric Distributions Mean, Variance, and Standard Deviation. Symmetric Distributions. Describing a “typical” value for a set of data when the distribution is at least approximately symmetric allows us to choose our measure of center:
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Describing Quantitative Data Numerically
Symmetric Distributions
Mean, Variance, and
Standard Deviation
54 + 59 + 35 + 41 + 46 + 25 + 47 + 60 + 54 + 46 + 49 + 46 + 41 + 34 + 22 =
659
On average, Babe Ruth hit approximately 44 home runs per season during the 15 seasons he played.
S =
Variance --S2
Find the
MEAN
3:mean(data list, freq list)
Find the Variance
8:variance(data list, freq list)
Find
Standard Deviation
7:stdDev(data list, freq list)
Find
Mean and Std Dev.
1:1-var stats(data list, freq list)