lecture 9-11

# lecture 9-11 - o Add the squared deviations o Divide the...

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Simple statistics: o Mean: the arithmetic average obtained by addinf up a series of numbers and dividing by the number of cases o Median: the value that occurs midway in a series of numbers that have been arranged in order of magnitude o Mode: Value of the variable that occurs more frequently than any other The mean is a measure of central tendency, it locates the middle of a group of measurements The Standard Deviation is a measure of dispersion. It estimates how far away from a mean a typical measurement is likely to be. Allows estimation of how common a particular observation is. Finding Standard Deviation o Subtract the mean from each observation and then square the result

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Unformatted text preview: o Add the squared deviations o Divide the sum of the squared deviations by the number of observations o Take the square root of the result Independent Variable: variable that causes a change in another variable Dependent Variable: variable that changes due to influence of another variable Correlation: Two variables related in some way, not necessarily through cause and effect Spurious correlation: casual relation is apparent between two variables when in fact none exists because a third, hidden variable causes both Scientific Control: holding a third variable constant while testing for a relationship between two variables...
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## lecture 9-11 - o Add the squared deviations o Divide the...

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