Mathematical Economics-Online Practice Exam 10

Test

# Question

1. Which of the following is/are not correct ?

1. A relation such as  and  is not possible
2. Spearman’s rank correlation is distribution free or non-parametric
3. If one of the regression coefficients are greater than unity, the other must also be greater than unity
4. Arithmetic mean of regression coefficients is always zero

II and III only

III and IV only

I , III and IV only

II only

# Question

2. Which of the following is correct ?

Correlation coefficient is independent of the change of origin

Correlation coefficient is independent of the change of scale

Both of the above

None of these

# Question

3. Which of the following is correct ?

Correlation coefficient is independent of the change of origin

Correlation coefficient is independent of the change of scale

Both of the above

None of these

# Question

4. Which of the following is true ?

Correlation coefficient is independent of the change of origin but depends on the change of scale

Coefficient of correlation between height and weight is negative

Scatter diagram helps in determining the degree of correlation

Correlation coefficient measures only the degree of linear relationship

# Question

5. If by x = -2 and bxy = –  then rxy is

1

-1

# Question

6. If regression equations are 8x – 10 = 64 and 40x – 18y = 320, then what are the mean values of x and y ?

y = 6, x = 0

x = 10, y = 2

x = 8, y = 0

x = 2, y = 10

# Question

7. If two regression coefficients are 0.8 and 0.6, what would be the value of the coefficient of correlation ?

0.14

0.69

1.6

0.31

# Question

8. Given the regression equation of y on x and x on y are respectively y = 2x and 6x – y = y. What is the value of correlation coefficient?

1.142

0.333

0.422

0.578

# Question

9. Which of the following is correct statement ?

{⏀}

⏀ = {⏀}

⏀ = {0}

⏀ = {}

# Question

10. If A is the set of all integral multiples of 3 and B is the set of all integral multiples of 5, then A ⋂ B is the set of all integral multiples of-

1.c.m (3, 5)

3 + 5

g.c.d. (3, 5)

3

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