Business Statistics 21. In a mesokurtic or normal distribution, 4 = 243. The standard deviation is:
81 27 9 3 View answer Correct answer: (D)
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 View answer Correct answer: (A)
23. If all the scores on examination cluster around the mean, the dispersion is said to be:
Small Large Normal Symmetrical View answer Correct answer: (A)
24. The range of the scores 29, 3, 143, 27, 99 is:
140 143 146 70 View answer Correct answer: (A)
25. The sum of absolute deviations is minimum if these deviations are taken from the:
Mean Mode Median Upper quartile View answer Correct answer: (C)
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 View answer Correct answer: (B)
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 View answer Correct answer: (A)
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 View answer Correct answer: (D)
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 View answer Correct answer: (B)
30. All odd order moments about mean in a symmetrical distribution are:
Positive Negative Zero Three View answer Correct answer: (C)