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

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7 Feb 2017
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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
!1
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