1. Study of scatteredness of observations is known as ________
Correct : A. Measure of dispersion
2. Standard deviation of first 50 natural number is__________
Correct : C. 14.43
3. Calculate coefficient of variation c)V.) for the following data 2,4,8,6,10 and 12 is____________
Correct : A. 48.86
4. Calculate Standard deviation for the following sample data 2,4,6,8,10 and 12. Is________
Correct : C. 3.42
5. Standard deviation is always___________
Correct : B. Positive
6. The arithmetic average of the absolute deviation of a series known as the________
Correct : C. Mean deviation
7. The average of the squared deviations about the arithmetic mean for a set of numbers is__________
Correct : D. Variance
8. The measure of dispersion which is expressed in terms of the nits of observations__________
Correct : A. Absolute measure
9. If the difference of the third and first quartiles is divided by the sum of the third and first quartiles then it is
known as __________
Correct : C. Coefficient of quartile deviation
10. The average of squared deviations about the arithmetic mean for a set of numbers is called___________
Correct : D. Variance
11. The measure of dispersion which is expressed in terms of the units of the observations I called________
Absolute measure
Correct : A. Variance
12. If the difference of the third and first quartile is divided by the sum of the third and first quartile then it is
known as__________
Correct : C. Coefficient of quartile deviation
13. The scatter in a series of values about the average is called___________
Correct : B. Dispersion
14. The measurements of spread or scatter of the individual values around the central point is called________
Correct : A. Measures of dispersion
15. The measures used to calculate the variation present among the observations in the unit of the variable is
called___________
Correct : C. Absolute measures of dispersion
16. The measures used to calculate the variation present among the observations relative to their average is
called_______
Correct : D. Relative measures of dispersion
17. The degree to which numerical data tend to spread about an average value called________
Correct : C. Variation
18. The measures of dispersion can never be__________
Correct : C. Negative
19. If all the scores on examination cluster around the mean, the dispersion is said to be________
Correct : A. Small
20. If there are many extreme scores on all examination, the dispersion is____________
Correct : A. Large
21. Given below the four sets of observations. Which set has the minimum variation?____________
Correct : D. 48, 49, 50, 51, 52
22. Which of the following is an absolute measure of dispersion?___________
Correct : C. Standard deviation
23. The measure of dispersion which uses only two observations is called___________-
Correct : C. Range
24. The measure of dispersion which uses only two observations is called__________
Correct : A. Range
25. In quality control of manufactured items, the most common measure of dispersion is___________
Correct : A. Range
26. The range of the scores 29, 3, 143, 27, 99 is_____________
Correct : B. 143
27. If the observations of a variable X are, -4, -20, -30, -44 and -36, then the value of the range will
be_________
Correct : D. 48
28. The range of the values -5, -8, -10, 0, 6, 10 is___________
Correct : D. 20
29. If the maximum value in a series is 25 and its range is 15, the maximum value of the series is___________
Correct : B. 15
30. Half of the difference between upper and lower quartiles is called___________
Correct : C. Mean deviation
31. If Q3=20 and Q1=10, the coefficient of quartile deviation is___________
Correct : B. 1/3
32. Which measure of dispersion can be computed in case of openend classes?___________
Correct : C. Quartile deviation
33. The sum of absolute deviations is minimum if these deviations are taken from the_____________
Correct : C. Median
34. The mean deviation is minimum when deviations are taken from____________
Correct : D. Zero
35. If Y = ax ± b, where a and b are any two numbers but a 0, then M.D(Y) is equal to__________
Correct : D. M.D(Y) + M.D(X)
36. The mean deviation of the scores 12, 15, 18 is_____________
Correct : B. 0
37. Mean deviation computed from a set of data is always____________
Correct : A. Negative
38. The average of squared deviations from mean is called_____________
Correct : B. Variance
39. The sum of squares of the deviations is minimum, when deviations are taken from__________
Correct : C. Median
40. Which of the following measures of dispersion is expressed in the same units as the units of
observation?__________
Correct : C. Coefficient of variation
41. Which measure of dispersion has a different unit other than the unit of measurement of values________
Correct : B. Standard deviation
42. Which of the following is a unit free quantity___________
Correct : D. Arithmetic mean
43. If the dispersion is small, the standard deviation is____________
Correct : C. Small
44. The value of standard deviation changes by a change of__________
Correct : D. None
45. The standard deviation one distribution divided by the mean of the distribution and expressing in
percentage is called_____________
Correct : A. Coefficient of Standard deviation
46. The positive square root of the mean of the squares of the deviations of observations from their mean is
called____________
Correct : D. Coefficient of variation
47. The variance is zero only if all observations are the___________
Correct : D. Same
48. The standard deviation is independent of_____________
Correct : B. Change of scale of measurement
49. If there are ten values each equal to 10, then standard deviation of these values is___________
Correct : C. 10
50. Which is a method of measuring correlation?________
Correct : D. Both of these
51. A scatter diagram is________
Correct : D. A graph showing x and y values
52. If there exists any relation between the sets of variables, it is called__________
Correct : C. Correlation
53. Perfect correlation is one Perfect correlation is one in which_________
Correct : C. None of these
54. Which of the following measurement scales is required for the valid calculation of Karl Pearson’s
correlation coefficient?__________
Correct : A. Ordinal
55. Which of the following point is not related with the utility of correlation?________
Correct : D. All of these
56. Which of the following is not cause of the correlation?____________
Correct : D. None of these
57. Which of the following is the highest range of r?__________
Correct : C. -1 and 1
58. When the correlation coefficient between x and y is positive, then as variable x decreases, variable y
Remains the same________
Correct : B. Decreases
59. Which of the following is most likely to be an inverse relationship?__________
Correct : B. Between price increase and demand for a certain product
60. Which of the following measurement scales is required for the valid calculation of spearman correlation
coefficient?_____________
Correct : B. Interval
61. The ratio of the average deviations is called__________
Correct : A. Regression
62. What will be the range of r when we find that the dependent variable increases as the independent variable
increases?__________
Correct : C. 0 .1 to 1
63. Which of the following is true if the estimating equation has to be a perfect estimator of the dependent
variable?______________
Correct : D. B and C
64. When a multiple correlation coefficient R 1.23 =1 , then R 2.13 is________
Correct : A. 1
65. When a multiple correlation coefficient r 1.2=1, then it shows __________
Correct : C. Perfect relationship
66. When the two regression line coincide, then r is_________
Correct : C. 0
67. Statistics branches include__________
Correct : D. Both A and B
68. The variables whose calculation is done according to the weight, height and length and weight are known
as__________
Correct : C. Continuous Variables
69. The number of accidents in a city during 2010 is___________
Correct : B. Continuous variable
70. The correlation coefficient is used to determine________
Correct : C. The strength of the relationship between the x and y variables
71. If there is a very strong correlation between two variables then the correlation coefficient must be _______
Correct : B. much smaller than 0, if the correlation is negative
72. In regression, the equation that describes how the response variable (y) is related to the explanatory
variable (x) is___________
Correct : B. the regression model
73. The relationship between number of beers consumed (x) and blood alcohol content (y) was studied in 16 male college students by using least squares regression. The following regression equation was obtained from this study: != -0.0127 + 0.0180x The above equation implies that__________
Correct : C. each beer consumed increases blood alcohol by an average of amount of 1.8%
74. SSE can never be _____________
Correct : A. larger than SST
75. Regression modeling is a statistical framework for developing a mathematical equation that describes how __________
Correct : C. one response and one or more explanatory variables are related
76. In regression analysis, the variable that is being predicted is the __________
Correct : A. response, or dependent, variable
77. Regression analysis was applied to return rates of sparrowhawk colonies. Regression analysis was used to study the relationship between return rate (x: % of birds that return to the colony in a given year) and immigration rate (y: % of new adults that join the colony per year). The following regression equation was obtained) ! = 31.9 – 0.34x Based on the above estimated regression equation, if the return rate were to decrease by 10% the rate of immigration to the colony would________________
Correct : B. increase by 3.4%
78. In least squares regression, which of the following is not a required assumption about the error term ε?
___________
Correct : A. The expected value of the error term is one.
79. Larger values of r 2 (R2 ) imply that the observations are more closely grouped about the __________
Correct : C. least squares line
80. In a regression analysis if r 2 = 1, then ___________
Correct : B. SSE must be equal to zero
81. The coefficient of correlation____________
Correct : B. is the square root of the coefficient of determination
82. In regression analysis, the variable that is used to explain the change in the outcome of an experiment, or
some natural process, is called ________
Correct : D. all of the above (a-c) are correct
83. In the case of an algebraic model for a straight line, if a value for the x variable is specified, then________
Correct : A. the exact value of the response variable can be computed
84. A regression analysis between sales (in $1000) and price (in dollars) resulted in the following equation: ! = 50,000 - 8X The above equation implies that an ________
Correct : D. increase of $1 in price is associated with a decrease of $8000 in sales
85. In a regression and correlation analysis if r 2 = 1, then ___________
Correct : D. SSR = SST
86. If the coefficient of determination is a positive value, then the regression equation__________
Correct : C. could have either a positive or a negative slope
87. If two variables, x and y, have a very strong linear relationship, then ____________
Correct : C. there might not be any causal relationship between x and y
88. If the coefficient of determination is equal to 1, then the correlation coefficient _______
Correct : B. can be either -1 or +1
89. In regression analysis, if the independent variable is measured in kilograms, the dependent variable ______
Correct : D. can be any units
90. The data are the same as for question 4 above. The relationship between number of beers consumed (x) and blood alcohol content (y) was studied in 16 male college students by using least squares regression. The following regression equation was obtained from this study: != -0.0127 + 0.0180x Suppose that the legal limit to drive is a blood alcohol content of 0.08. If Ricky consumed 5 beers the model would predict that he would be____________
Correct : B. 0.0027 below the legal limit
91. If the correlation coefficient is 0.8, the percentage of variation in the response variable explained by the
variation in the explanatory variable is____________
Correct : B. 80%
92. If the correlation coefficient is a positive value, then the slope of the regression line ___________
Correct : D. can not be zero
93. If the coefficient of determination is 0.81, the correlation coefficient __________
Correct : A. is 0.6561
94. A fitted least squares regression line ____________
Correct : B. is evidence for a cause-effect relationship between x and y
95. Regression analysis was applied between $ sales (y) and $ advertising (x) across all the branches of a major international corporation. The following regression function was obtained) ! = 5000 + 7.25x If the advertising budgets of two branches of the corporation differ by $30,000, then what will be the predicted difference in their sales? __________
Correct : A. $217,500
96. Suppose the correlation coefficient between height (as measured in feet) versus weight (as measured in pounds) is 0.40. What is the correlation coefficient of height measured in inches versus weight measured in ounces? [12 inches = one foot; 16 ounces = one pound] _______
Correct : A. 0.40
97. Assume the same variables as in question 28 above; height is measured in feet and weight is measured in pounds. Now, suppose that the units of both variables are converted to metric (meters and kilograms). The impact on the slope is__________
Correct : A. the sign of the slope will change
98. Suppose that you have carried out a regression analysis where the total variance in the response is 133452 and the correlation coefficient was 0.85. The residual sums of squares is____________
Correct : A. 37032.92
99. In a regression analysis if SSE = 200 and SSR = 300, then the coefficient of determination is ___________