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# Lesson 2 Notes STAT 200

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Pennsylvania State University

Statistics

STAT 200

Mengzhao Gao

Spring

Description

STAT 200
Elementary Statistics
Lesson 2 Turning Data Into Information
Distribution- shows a variable’s pattern of variation, as given by the values of the
variables and their frequencies
Histograms- represent frequencies by area and not height
Stem-and-leaf plot- consists of a vertical list of stems after which are recorded a
horizontal list of one-digit leaves
Symmetric- similar on both sides
Skewed-values are more spread out on one side of the center than the other
Unimodal- when there is one prominent peak in a graph’s distribution
Bimodal- when there are two prominent peaks in a graph’s distribution
Mean-usual numeric average, calculated as the sum of the data values divided by the
number of values
Median- middle data value for an odd number of observations, after the sample has
been ordered from smallest to largesse. The average of the middle two values if even
number in the sample.
Range- found by subtracting the minimum value from the largest value
First quartile (Q1)- the middle of the values below the median
Third quartile (Q3)- the middle of the values above the median
IQR (Interquartile range)- found by subtracting Q1 from Q3
Five number summary- consists of minimum and maximum values, Q1 and Q3, and the

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