PLS 210-A01

Measures of central tendency

the (arithmetic) mean x-bar etc
median Md.=
mode Mo.=

(FIGURE OUT HOW TO DO MATHEMATICAL FORMULAE IN HTML)

MEAN: that value of X such that there are as many observations less than the median as there are observations greater than the median

MEDIAN is X sub-I at the median position (Md. Position) =

the median position is not the median!

frequency polygon: the line drawn from point to point on an XY-axis graph

histogram: bar graph started half-unit below the number

smooth curve: preferred usage for graphing

discrete variable
continuous variable

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