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