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STAT 1430 FINAL EXAM

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STAT 1430 FINAL EXAM *CORRELATION & REGRESSION* the relationship between x and y in a scatterplot is explained by what 3 things? - ✔✔pattern, direction, strength 1.) r pos 2.) r neg 3.) r = ... 0 4.) r = +1 5.) r = -1 - ✔✔1.) upward relationship 2.) downward relationship 3.) no linear relationship 4.) strongest possible linear relationship (straight line) 5.) straight line as well what are the ranges for - strong - moderate - weak - none - ✔✔- +-.7 - +-.5 - +-.3 - +-.0 properties of correlation: - 2 ___________ variables only - ___________ relationship only - units or no? - if you switch x and y is it the same correlation? - is affected by _________ and ___________ - ✔✔- quantitative - linear - no units - yes same correlation - outliers, skewness sum of squares for error (sse) - ✔✔drawing lots of error lines until you find the perfect fitting line with minimal distance between outlier points correlation = - ✔✔r best fitting regression line = - ✔✔y hat = b0 +b1x b1 (slope) = - ✔✔r * sd of Y / sd of X [Show More]

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