Business Statistics and Research Methods MCQs

Question 1

If the standard deviation of a variable X is s and if y = a + bs, where a and b are constants, the standard deviation of y would be

Accepted Answer

bs

Answer

a + bs

Answer

$$\sqrt {{	ext{b}} \cdot {	ext{s}}} $$

Answer

b2s

Question 2

Which of the following qualities an investigator must possess in collection of primary data? 1. Skill 2. Tact 3. Accuracy 4. Neutrality 5. Personal bias Select the correct answer using the options given below

Accepted Answer

1, 2, 3 and 4

Answer

2, 3, 4 and 5

Answer

Both 4 and 5

Answer

None of the above

Question 3

The measurement based on all the values in the series is

Accepted Answer

Standard deviation

Answer

Range

Answer

Quartile deviation

Answer

All of these

Question 4

The standard deviation of the first group is 12 and the mean is 15. The standard deviation of the second group is 18 and the mean is 25. Which group is more stable?

Accepted Answer

Second group

Answer

First group

Answer

First and second both group

Answer

None of these in first and second group

Question 5

Next year, sales may rise, fall or remain the same as this year, with the following respective probabilities: 0.56, 0.23 and 0.21. The probability of sales remaining the same or falling is:

Accepted Answer

0.44

Answer

0.05

Answer

0.12

Answer

0.13

Question 6

Which of the following is a probability-based sample selection technique?

Accepted Answer

Multistage stratified

Answer

Judgment sampling

Answer

Subjective sampling

Answer

Accidental sampling

Question 7

Which is most likely to yield qualitative data?

Accepted Answer

Focus group

Answer

Mail survey

Answer

Telephone interview

Answer

None of the above

Question 8

The term (1-B) is called:

Accepted Answer

Power of the test

Answer

Level of the test

Answer

Size of the test

Answer

None of the above

Question 9

Baye's Theorem is considered as theorem of total probability that is given by:

Accepted Answer

P(A) = P(E1) P(A|E1) + P(E2) P(A|E2) + . . . . . (n terms)

Answer

P(A) = P(E1) P(A|A1) + P(a) P(A|A1) + . . . . . (n terms)

Answer

P(A) = P(E) P(E|E1) + P(E) P(A|E2) + . . . . . (n terms)

Answer

None of the above