correlation

iNZight gives r

POSITIVE linear correlation

r=1 "Perfect"0.9<r<1 "Strong"

0.7<r<0.9 "Significant"0.5<r<0.7 “Moderate“

0.3<r<0.5 "Weak”0<r<0.3 "Not significant”

NEGATIVE linear correlation

r=-1 "Perfect"-0.9<r<-1 "Strong"

-0.7<r<-0.9 "Significant"-0.5<r<-0.7 “Moderate“

-0.3<r<-0.5 "Weak”0<r<-0.3 "Not significant”

LINKS TO HELP• http://www.bbc.co.uk/schools/gcsebitesize/maths/statistics/scatterdiagramsact.shtml• http://maths.nayland.school.nz/Year_13_Maths/3.9_Bivariate_data/7_Corr_Coefficient_r.html

REMEMBER

• STATE THE OBVIOUS• POSITIVE OR NEGATIVE• INCREASING OR DECREASING• RELATIONSHIP OR NO RELATIONSHIP• LINEAR• EG: strong positive linear relationship• EG: as x increases, y increases…