INTERNATIONAL UNIVERSITY OF BUSINESS AGRICULTURE AND TECHNOLOGY

Quiz examination

STA 240 Set: X

Full marks: 100 Time: 50 minutes

1. What are the differences between correlation and regression?

2. Give examples of the following:

a) Regression

b) Positive correlation

c) Negative correlation

d) Zero correlation

3. Interpret the following results :

a) r = 0.79 b) r = 0.65 c) r = 0.34 d) r = 0.18

4. Let X=fertilizer, Y=production of rice.

X Y

1 4

2 5

3 6

a) Find the correlation coefficient, r.

b) Interpret the result.

c) Fit a regression line between X and Y.

d) Interpret the result.

e) When X=10, what will be the value of Y?

Md. Mortuza Ahmmed