PSYC1001 Lecture Notes - Lecture 4: Descriptive Statistics, Skewness, Central Tendency

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19 May 2018

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Predictions and descriptive statistics

Descriptive stats

• Used to summarize a collection of data

• Often use either to measure central tendency or variability of scores

Measures of central tendency

Mode

Most popular/frequent score

Median

Middle score

If even number of scores then average of 2 middle scores

Mean or average

Sum of all scores/no of all scores

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• Best measure for estimating a population mean from a

sample

• Means usually not real scores that occurred

• Can be easily affected by extreme values

Variability measures

• Distribution of data

• Shapes - positive or negative skew, symmetrical

Screen clipping taken: 7/06/2017 3:18 PM

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