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Unformatted text preview: statistic. Has standard deviation get larger, then standard error gets larger, confident intervals get larger, but t statistic gets smaller. So we have a statistic and now we need to compare it to a critical value. If statistic is greater than critical value, then there is relationship between two variables if the statistic is less than crictial value, then no relationship. First we need to know degrees of freedom. This gets you through hurdle 3 Correlation: Positive correlation as X increases, Y increases Negative correlation as X decreases, Y decreases Use Pearsons R If all points on line and positive, then it equals 1. If all the points on line and negative slope, then it equals -1. Are sure are we that the correlation is either positive or negative? First get the t statistic and see if its greater than or less than critical value. So now we have to see if its substantly significant....
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- Summer '08