September 29

# September 29 - September 29, 2011 Last week: statistics,...

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September 29, 2011 Last week: statistics, distributive statistics, measures of central tendency, difference b/w mean, median, and mode, which is the best measure of central tendency, (mean is affected by outliers scores, and extremes) This week: continue with statistics Descriptive Statistics: Measure of central tendency Variability - how much scores spread out from the mean… - Different types of variability, one is called Range; subtract the lowest from the highest score in the distribution - Standard Deviation: measures the AVERAGE spread of scores (deviation) from the mean. IT takes into account all scores in the distribution, not just the highest and the lowest. The greater the variability, the greater the standard deviation (Sd) *pick out the one that has the greatest standard deviation…. - Standard deviation first find out what the mean, and then takes each score and figures out how far it is from the mean. - The more spread out a score is from the central mean, the greater the standard deviation, vice versa Normal distribution: - Hypothetical distribution - “if I have gone out and collected this data, this is what I would have obtained” - Also known as “bell curve” - Characteristics: the mean, the median, and the mode are all different value, but in the normal distribution they will all be the same value - It is symmetrical - No one has actually collected this data normal distribution

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## This note was uploaded on 11/11/2011 for the course PSYCHOLOGY 1010 taught by Professor Jubis during the Spring '11 term at York University.

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September 29 - September 29, 2011 Last week: statistics,...

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