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Chapter 10 - I Chapter 10 A Brief Course in Statistics...

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1.26.3 Chapter 10 – A Brief Course in Statistics I) Descriptive Statistics – statistics used to summarize or describe a set of observations a. Central Tendency – average b. Dispersion (variability) – how the scores disperse around the mean i. Range – difference between the highest and lowest score ii. Standard Deviation – the average measure of the difference between the individual scores and the mean iii. Shapes of Distribution : 1. Rectangular Distribution – all scores are equal in frequency 2. Bimodal Distribution – two ranges that are more common then others 3. Normal Distribution (bell shape) – the way most natural phenomena distribute c. Mean – used in interval and ratio scales, can be misleading in dealing with extreme scores d. Median – used in ordinal scales, used when there are extreme scores or distribution isn’t normal e. Mode – used in nominal scales, used when only a really simple description of the score is needed II) Inferential Statistics – statistics used to interpret or draw inferences out of data.
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