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lecture3 - Psych 100A Winter 2010 Lecture 3 Descriptive...

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Psych 100A Winter 2010 Lecture 3: Descriptive Statistics: N i l i f d Numerical summaries of data: 1.Measures of location (cont.) 2.Measures of variation 1

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Calculating median Don’t use the Kiess section called “calculating the mean with the percentile f l ” h f ll d formula”. Use the following procedure instead. (1) Put all the entries in order from largest to smallest. If one value is b d N ti th it h ld N observed N times then it should appear N times in the list. (For example if three people have score 70 then there are three 70s in the list). There should be the same number of items in the list as there are entries in the original data set. 2
Calculating median (cont.) (2) If the data set contains an odd number of entries, then the median is the ddl l f h d d l middle value of the ordered list. For example if we have the list 3, 3, 2, 2, 1, 1 1 The median is the 4th value median 1, 1. The median is the 4th value, median = 2. (3) If th d t t t i (3) If the data set contains an even number of entries, the median is halfway between the two values closest to the middle of the ordered list. For example if we have the list 3, 2, 2, 1, 1, 1, then the median is (2+1)/2 = 1.5. 3

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