APSY 1-30

# APSY 1-30 - APSY 1/30/08 Difference YES YES YES YES...

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APSY 1/30/08 Friday Feb. 1 st 12-1:30PM Rosellini Psych Measures of Central Tendency & Variability - Statistical indices of central tendency and variability are more efficient and concise to describe scores than frequency distributions. o We often need just 1 number to describe our data (e.g. average salary) - These indices form the basis of many test we learn. Central Tendency: Middle of a group of scores - Mean, median and mode - Its most logical to use the Central tendency to attain information because frequency is highest at central tendency. - The most commonly used measure of central tendency is the mean. Because of its sensitivity to data. o Ordinary average. - Median, exact middle of data set. o Outliers (extreme scores) have no affect on the median as oppose to the mean. - Unlike the mean, changing the values in the score will not change the mode. Mode is not a good representative of the value of distribution o However, for nominal variables it is a good way to describe the central tendency. -

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## APSY 1-30 - APSY 1/30/08 Difference YES YES YES YES...

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