Business Statistics and Research Methods MCQs

Question 1

If unexplained variation between variables X and Y is 36%, what is the coefficient of correlation between the variables?

Accepted Answer

0.8

Answer

0.36

Answer

0.64

Answer

0.6

Question 2

Consider the following statements. Statement-I: When a null hypothesis gets rejected in statistical hypothesis testing, it is known as II type error in hypothesis testing. Statement-II: When a sample is small sized and parametric value of the standard deviation is not known, z-test is the most appropriate test for hypothesis testing.

Accepted Answer

Both statements are incorrect

Answer

Both statements are correct

Answer

Statement-I is correct while starement-II is incorrect

Answer

Statement-I is incorrect while sratement-II is correct

Question 3

Goodness of fit of a distribution is tested by:

Accepted Answer

Chi-square test

Answer

T test

Answer

F-test

Answer

z-test

Question 4

The most important factors causing seasonal variations are

Accepted Answer

weather and social customs

Answer

growth of population

Answer

technological improvements

Answer

change in fashions

Question 5

Regression model is a statistical framework for developing a mathematical equation that describes how:

Accepted Answer

one response and one or more explanatory variables are related

Answer

one explanatory and one or more response variables are related

Answer

several explanatory and several response variables response are related

Answer

all of these are correct

Question 6

Which of the following statement(s) is/are correct?

Accepted Answer

Both A and B

Answer

When n is small, the T-distribution is far from normal

Answer

When n is infinite, it is identical with normal distribution

Answer

Neither A nor B

Question 7

If the number of observations is such that nx ny is large (n > 20), a normal approximation can be used with

Accepted Answer

$${\mu _\mu } = \frac{{{n_x}.{n_y}}}{2}$$

Answer

$${\mu _\mu } = \frac{{{n_x}}}{{{n_y}}}$$

Answer

$${\mu _u} = \frac{{{n_y}}}{{{n_x}}}$$

Answer

$${\mu _u} = \frac{{{n_x}.{n_y}}}{4}$$

Question 8

Positive perfect correlation is

Accepted Answer

1

Answer

-1

Answer

0

Answer

None of these

Question 9

The grouping of relating facts into classes is called

Accepted Answer

classification

Answer

diagram

Answer

graph

Answer

tabulation