Unit 4: Assignment 1

Total marks = 20

Correlation

Question 1 True False questions, put X to indicate your response [6]

1.1 Correlation coefficient r quantifies the relationship between quantitative variables X and Y

True False

1.2 Correlation coefficient r quantifies the linear relation relationship between quantitative variables X and Y

True False

1.3 The closer r is to 1, the stronger the linear relation between X and Y

True False

1.4 The closer r is to -1 or 1, the stronger the linear relation between X and Y

True False

1.5 If r is close to zero, X and Y are unrelated

True False

1.6 If r is close to zero, X and Y are unrelated in a linear way

True False

Question 2

Interpret the correlation graphs below [4]

Correlations CIG BLAD LUNG KID LEUK CIG Pearson Correlation 1 704* * 697** 487** -.068 Sig. (2-tailed) 000 000 001 .659 N 44 44 44 44 44 BLAD Pearson Correlation 704* * 659** .359* 162 Sig. (2-tailed) .000 000 .017 .293 N 44 44 44 44 44 LUNG Pearson Correlation 697** 659** 1 283 -. 152 Sig. (2-tailed) 000 000 .063 .326 N 44 44 44 44 44 KID Pearson Correlation .487* * .359* 283 1 .189 Sig. (2-tailed) 001 .017 .063 .220 N 44 44 44 44 44 LEUK Pearson Correlation - .068 .162 -. 152 189 1 Sig. (2-tailed) 659 293 .326 .220 N 44 44 44 44 44 *. Correlation is significant at the 0.01 level (2-tailed)Measure 3 vs Measure 4 103 102. 00 30 101 107 99 97 93 99 100 101 102 103 97 98 99 100 101 102 105 GROUP: 1 GROUP: 2 MEASURE4 103 102 60 90 101 100 99 97 93 99 100 101 102 109 97 98 99 100 101 102 103 GROUP: 3 GROUP: 4 MEASURES