# CJ 2602 Lecture Notes - Lecture 4: Wendy Thomas, Frequency Distribution, Central Tendency

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CJ 2620 - Dr. Wendy Thomas

Tuesday, February 7, 2017

CJ Statistics

Notes 4

-Measures of Tendency

-mean: the average

-median: the middle score

-mode: the most frequent score

-Most frequent score

-Median

-used for ordinal or interval level data only

-the middle point of a frequency distribution which divides the data into two equal

parts

-half the cases are above, half below

-use the formula (N+1)/2 to locate the POSITION of the median

-example - for odd number of values in a data set (number of responses is 7)

-11, 12, 13, 16, 17, 20, 25

-median = (7+1)/2

-median = 4

-position of the median in a string of numbers is 4

-count over to the 4th number

-example - for even number of values in a data st (number of responses 8)

-11, 12, 13, 16, 17, 20, 25, 26

-median = (8+1)/2

-median = 4.5

-position of the median in above string of numbers is 4.5

-count over to the 4.5 number

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