1. Which of the following is correct?

2. Which of the following statements is/are not correct ?

1. Correlation coefficient is always positive
2. Scatter diagram helps in determining the degree of correlation
3. If r = + 1 or – 1, the correlation will be perfect.
4. Correlation coefficient is a relative measure.

3. Which of the following is/are correct?

1. Correlation coefficient is a relative measure.
2. -1  < r  < 1
3. If r = + or – 1, the correlation will be perfect.
4. Correlation coefficient measures only the degree of linear relationship.

4. Which of the following is/are correct ?

1. Negative correlation means that both the variables have decreasing values.
2. Positive correlation means that both the variables have increasing values.
3. If the direction of change in the two variables in the same, the two variables will be positively correlated.
4. If the change in the two variables is in opposite direction, the correlation will be negative.

5. Which of the following is an example of positive and perfect correlation ?

6. Which of the following is an example of negatives and perfect correlation ?

7. If x = y + 2, then –

8. Which of the following is/are correct ?

1. If x = 2y, x and y will be perfectly correlated.
2. If x = 30 – y, there will be a perfect negative correlation between x and y
3. If x = y + 2, r = + 1
4. R = 0 means absence of correlation.

9. Which of the following statements is true ?

10. Which of the following is correct ?