The unit of correlation coefficient between height in feet and weight in kg is

1

(a)

Kg/Feet

(b)

Percentage

(c)

Non existent

The range of simple correlation coefficient is:

1

(a)

0 to infinity

(b)

Minus one to plus one

(c)

Minus infinity to infinity.

If r_xy is positive the relation X and Y is of the type:

1

(a)

When Y increase, X increases

(b)

When Y decreases, X decreases

(c)

When Yincreases, X does not change

If r_xy is zero, the variable X and Y are

1

(a)

Linearly Related

(b)

Not Linearly Related

(c)

Independent

If precisely measured data are available the simple correlation coefficient is

1

(a)

More accurate than rank correlation coefficient

(b)

Less accurate than rank correlation coefficient

(c)

As accurate as rank correlation coefficient

Why is correlation preferred to covariance as a measure of association?

3

(a)

Can r lie beyond + 1 and - 1 depending on the type of data?

3

(a)

Does zero correlation mean independence?

3

(a)

Collect the price of five vegetables from your local market every day for a week. Calculate their correlation coefficients. Interpret the results.

3

(a)

Measure the height of your classmates. Ask them the height of their bench mates. Calculate the coefficients of correlation, Interpret the result.

3

(a)

Interpret the values of r as 1, - 1 and 0.

3

(a)

Draw the scatter diagram and interpret it:

X:	90	80	70	60	50	40	30	20	10
Y:	10	20	30	40	50	60	70	80	90

3

(a)

Draw the scatter diagram and interpret it:

X:	34	36	37	8	39	40	42	45	50
Y:	3	1	8	7	6	2	4	0	2

3

(a)

If r = 0.6 and n = 64 find out the probable error of the coefficient of correlation.

3

(a)

Calculate 'R' from the following data.

Student No. :	1	2	3	4	5	6	7	8	9	10
Rank in Maths :	1	3	7	5	4	6	2	10	9	8
Rank in Stats :	3	1	4	5	6	9	7	8	10	2

3

(a)

2 judges mark the performances given by 7 contestants in a talent competition

Contestant	A	B	C	D	E	F	G
Judge 1	14	17	12	9	15	10	11
Judge 2	10	9	13	14	8	15	12

Find rank Correlation.

3

(a)

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)