Business Statistics
21. In a mesokurtic or normal distribution, 4 = 243. The standard deviation is:
- 81
- 27
- 9
- 3
3
22. The measurements of spread or scatter of the individual values around the central point is called:
- Measures of dispersion
- Measures of central tendency
- Measures of skewness
- Measures of kurtosis
Measures of dispersion
23. If all the scores on examination cluster around the mean, the dispersion is said to be:
- Small
- Large
- Normal
- Symmetrical
Small
24. The range of the scores 29, 3, 143, 27, 99 is:
- 140
- 143
- 146
- 70
140
25. The sum of absolute deviations is minimum if these deviations are taken from the:
- Mean
- Mode
- Median
- Upper quartile
Median
26. Which of the following measures of dispersion is expressed in the same units as the units of observation?
- Variance
- Standard deviation
- Coefficient of variation
- Coefficient of standard deviation
Standard deviation
27. The standard deviation is independent of:
- Change of origin
- Change of scale of measurement
- Change of origin and scale of measurement
- Difficult to tell
Change of origin
28. Which of the following statements is correct?
- The standard deviation of a constant is equal to unity
- The sum of absolute deviations is minimum if these deviations are taken from the mean.
- The second moment about origin equals variance
- The variance is positive quantity and is expressed in square of the units of the observations
The variance is positive quantity and is expressed in square of the units of the observations
29. In a set of observations the variance is 50. All the observations are increased by 100%. The variance of the increased observations will become:
- 50
- 200
- 100
- No change
200
30. All odd order moments about mean in a symmetrical distribution are:
- Positive
- Negative
- Zero
- Three
Zero