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 testing the significance of the correlation coefficient (p) for temperature (x) and number of cups of coffee sold per hour
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This note was uploaded on 02/07/2012 for the course MATH 1025 taught by Professor Raney during the Fall '10 term at Century College.

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

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