Elective Mathematics

Question 1

1For 6 pairs of ranks with Σd² = 14, Spearman's coefficient is

Medium

A. 0.4 B. 0.8 C. 0.6 D. −0.6

Question 2

2Spearman's coefficient uses the

Easy

A. ranks of the data B. raw totals C. means only D. modes

Question 3

3The regression line of y on x passes through

Hard

A. the origin always B. (0, ȳ) C. (x̄, 0) D. the point (x̄, ȳ)

Question 4

4For 5 pairs of ranks, Σd² = 4. Using Spearman's formula, find the rank correlation coefficient.

Medium

A. 0.8 B. 0.2 C. 0.96 D. −0.8

Question 5

5A correlation coefficient close to 0 indicates

Easy

A. little or no linear relationship B. causation C. perfect negative relationship D. strong positive relationship

Question 6

6A line of best fit on a scatter graph should

Easy

A. pass through the mean point (x̄, ȳ) B. join the first and last points C. pass through the origin always D. be vertical

Question 7

7A correlation coefficient of −1 indicates

Easy

A. no correlation B. perfect negative correlation C. perfect positive correlation D. weak correlation

Question 8

8If Σd² = 0 for 5 pairs of ranks, Spearman's coefficient is

Easy

A. 0.5 B. −1 C. 0 D. 1

Question 9

9A rank correlation coefficient of +1 means

Easy

A. perfect negative correlation B. weak positive correlation C. perfect positive correlation D. no correlation

Question 10

10A correlation coefficient of −0.9 shows

Easy

A. weak positive correlation B. strong positive correlation C. no correlation D. strong negative correlation