Correlation and regression

Question 1 of 10

If y = 5 + 5x, then y when x = 6 is ___

Question 2 of 10

A correlation coefficient always lies between −1 and 1.

Question 3 of 10

Rankings of 6 students in two tests give Σd² = 16. Find Spearman's coefficient to 2 decimal places.

Question 4 of 10

Ranks of six students in two examinations are (1, 2), (2, 1), (3, 4), (4, 3), (5, 6), (6, 5). Calculate Spearman's rank correlation coefficient.

Question 5 of 10

A scatter diagram is used to show

Question 6 of 10

If y = 5 + 4x, then y when x = 1 is ___

Question 7 of 10

Spearman's rank correlation coefficient is r = 1 − 6Σd²/

Question 8 of 10

A correlation coefficient of zero suggests

Question 9 of 10

Rankings of 7 students in two tests give Σd² = 16. Find Spearman's coefficient to 2 decimal places.

Question 10 of 10

If y = 3 + 6x, then y when x = 3 is ___