Statistics and Econometrics-Online Practice Exam 6

Test

Question

1. If the data is qualitative, which of the following averages can be calculated?

A.M

G.M

Median

Mode

Question

2. Which of the following statements is correct ?

The arithmetic mean can be computed even if an observation of the series is missing

Arithmetic mean is always the best measure of central tendency

The value of median of a data set gets affected by extreme values

Median can be calculated from a grouped data with open-ended classes

Question

3. The mean marks of 100 students were found to be 40, Later on it was observed that score of 53 was misread as 83. What is the corrected mean corresponding to the corrected score ?

36.9

39.7

38

37.8

Question

4. The median marks of 50 students were 60. But, later on it was found that the marks of a student who secured 75 were wrongly taken as 65. What is the correct median ?

76

56

60

68.8

Question

5. One of the measures of dispersion which is more useful in case of open-ended distributions is

Range

Quartile deviation

Mean Deviation

Standard deviation

Question

6. Standard deviation is always computed from

Mean

Mode

Median

Mode

Question

7. Mean deviation is

More than S. D

Less than S. D

Not related to S.D.

Equal to standard deviation

Question

8. Coefficient of variation is given by

Question

9. Quartile deviation is based on the-

Middle 50 per cent of the items

Highest 25 per cent of the items

Lowest 25 per cent of the items

Highest 50 per cent of the items

Question

10. If 25% of the items are less than 20 and 25% are more than 40, the quartile deviation is-

10

30

40

20

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