Test 4 (final) cheat sheet

Test 4 (final) cheat sheet - Ex Is the correlation between...

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Correlation Nonlinear correlation- (parabola) No Correlation- dots all over the graph (no apparent order). Negative linear correlation - as one variable (x) gets larger; the other (y) gets smaller. Positive linear correlation - as one variable (x) gets larger; the other (y) gets larger. r = -1 perfect negative correlation, r = 1 perfect positive correlation. r ≈ 0, No or weak correlation. Ordered pairs (x,y). X is the independent (explanatory), y is the dependant (response) variables. - Identify the explanatory (independent) variable and the response (dependant) variable. Ex a researcher wants to determine if a child’s age can be used to predict the number of word’s in their vocabulary. Age is explanatory # of words is response. Ex an emergency service wants to see if there is a relationship between outside temperature and the number of emergency calls it receives in a day. Temperature is explanatory # of calls is response. Ex Calculate the correlation coefficient (r) for outside temp (x) and number of cups of coffee sold per hour (y). X 6 5 6 0 5 5 5 0 4 5 4 0 3 5 3 0 25 y 8 1 0 11 1 3 1 2 1 6 1 9 2 2 23 For correlation coefficient (r) enter data into lists x (L1) Y(L2), use LinReg (ax+b) L1,L2 r=-0.973 strong neg correlation Ex Find the critical values and rejection region to use for

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