Correlation and regression

Question 1 of 10

Perfect positive correlation has coefficient

Question 2 of 10

A scatter diagram is used to show

Question 3 of 10

The regression line of y on x is y = 1 + 4x. Estimate y when x = 7.

Question 4 of 10

Explain the meaning of positive, negative and zero correlation with a sketch of each.

Question 5 of 10

Correlation proves that one variable causes the other.

Question 6 of 10

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

Question 7 of 10

Extrapolating far beyond the data is always reliable.

Question 8 of 10

The table shows marks of five students in Mathematics (x) and Physics (y): x: 2, 4, 6, 8, 10 and y: 3, 5, 6, 9, 12. Find the regression line of y on x and estimate y when x = 7.

Question 9 of 10

Rankings of 6 students in two tests give Σd² = 15. Find Spearman's coefficient to 2 decimal places.

Question 10 of 10

The pairs (x, y) are (1, 5), (2, 8), (3, 11), (4, 14), (5, 17). What is the correlation coefficient?