Calculate the coefficient of correlation between the height of fathers in inches and (X) and their sons (Y).

X	64	66	57	67	68	69	70	72
Y	67	56	65	68	72	72	69	71

6

(a)

Calculate correlation coefficient between X and Y and comment on their relationship.

X	-3	-2	-1	1	2	3
Y	9	4	1	1	4	9

6

(a)

Calculate correlation coefficient between X and Y and comment on their relationship.

X	1	3	4	5	7	8
Y	2	6	8	10	14	16

6

(a)

Define the term correlation. What purpose does it solve?

6

(a)

How is correlation different from causation?

6

(a)

Explain different types of correlation.

6

(a)

Draw a scatter diagram for:
(I) Perfect positive correlation
(ii) Perfect negative correlation
(iii) Zero correlation
(iv) Low positive correlation
(v) low negative correlation
(vi) High positive correlation

6

(a)

Differentiate between degree and direction of correlation.

6

(a)

How is value of correlation interpreted?

6

(a)

Describe how to tell whether a set of data points shows a positive correlation, a negative correlation, or approximately no correlation.

6

(a)