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Week 2_Ch4_Central Tendency

# Week 2_Ch4_Central Tendency - Chapter 4 Measures of Central...

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Chapter 4 Measures of Central Tendency

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DescriptiveStatistics Measures of: 1. Central tendency (typical score) Mode, Median, Mean. 1. Variability (amount of variability) Range, Variance, Standard deviation.
Mode The most frequently occurring score Unimodal : distribution has only onehump. Bimodal : distribution has two humps. Multimodal : distribution has morethan 2 humps. Mode(s) is (are) the “biggest” hump(s).

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Mode Not a stablemeasureof central tendency. Not affected by extreme scores. Can beused with nominal, ordinal, or interval data (e.g. religious affiliation as nominal data).
Example Six patients in a psychiatric ward wereobserved and the number of times each patient requested assistancefrom thenursing staff during a 24-hour period was recorded.

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What is theMode? Patient Number of requests 1 3 2 4 3 0 4 7 5 2 6 4
Example Herearetheages in years of thecars worked on by the VillageAutohaus last week : 5, 6, 3, 6, 11, 7, 9, 10, 2, 4, 10, 6, 2, 1, 5 What is the mode of the data?

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Median Thescorethat has an equal number of scores aboveand below it (the50th percentile). It cuts thedistribution into two equal parts. Position of median = (N+1)/2
To Find Median: For odd number of scores with no tienumbers around the median: Arrangedata (ordinal or interval) in order of size- the middlemost point in thedistribution is themedian.

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Example Thenumber of times 5 patients requested pain killers following a wisdomtooth extraction: 1, 3, 4, 5, 9 What is themedian?
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Week 2_Ch4_Central Tendency - Chapter 4 Measures of Central...

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