1. Scores that differ greatly from the measures of central tendency are called:
a. Raw scores
b. Extreme scores
c. Z-scores
d. The best scores
Correct Answer: b
2. The measure of central tendency listed below is:
a. The range
b. Standard deviation
c. The mean
d. The raw score
Correct Answer: c
3. The total of all the observations divided by the number of observations is called:
a. Geometric mean
b. Median
c. Harmonic mean
d. Arithmetic mean
Correct Answer: d
4. The scatter in a series of values about the average is called:
a. Skewness
b. Symmetry
c. Dispersion
d. Central tendency
Correct Answer: c
5. If all the scores on examination cluster around the mean, the dispersion is said to be:
a. Small
b. Large
c. Normal
d. Symmetrical
Correct Answer: a
6. If there are many extreme scores on all examination, the dispersion is:
a. Symmetric
b. Large
c. Small
d. Normal
Correct Answer: b
7. If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:
a. 10
b. 7
c. 3
d. 5
Correct Answer: b
8. The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is:
a. 15
b. 6
c. 4
d. 10
Correct Answer: b
9. The measures of dispersion can never be:
a. Equal to 2
b. Positive
c. Negative
d. Zero
Correct Answer: c
10. Change of origin and scale is used for calculation of the:
a. Arithmetic mean
b. Weighted mean
c. Geometric mean
d. Lower and upper quartiles
Correct Answer: a
11. When the values in a series are not of equal importance, we calculate the:
a. Harmonic mean
b. Geometric mean
c. Arithmetic mean
d. Weighted mean
Correct Answer: d
12. The sum of deviations is zero when deviations are taken from:
a. Median
b. Mode
c. Geometric mean
d. Mean
Correct Answer: d
13. The degree to which numerical data tend to spread about an average value called:
a. Flatness
b. Constant
c. Variation
d. Skewness
Correct Answer: c
14. The population mean μ is called:
a. Discrete variable
b. Continuous variable
c. Parameter
d. Sampling unit
Correct Answer: c
15. A qualitative characteristic is called:
a. Attribute
b. Variable
c. Constant
d. Association
Correct Answer: a
16. The range of the scores 29, 3, 143, 27, 99 is:
a. 146
b. 70
c. 140
d. 143
Correct Answer: c
17. If an attribute has two classes, it is called:
a. Dichotomy
b. Mainfold classification
c. Trichotomy
d. Simple classification
Correct Answer: a
18. The arithmetic mean is highly affected by:
a. Odd values
b. Extremely large values
c. Extremely small values
d. Moderate values
Correct Answer: b
19. The average of squared deviations from mean is called:
a. Coefficient of variation
b. Variance
c. Mean deviation
d. Standard deviation
Correct Answer: b
20. The total of all frequencies n is of order:
a. One
b. Two
c. three
d. Zero
Correct Answer: d
21. In a Chi-square distribution no expected frequency should be:
a. Both (a) and (b)
b. Less than 5
c. More than 5
d. Equal to 5
Correct Answer: b
22. A specific characteristic of a population is called:
a. Parameter
b. Statistic
c. Variable
d. Sample
Correct Answer: a
23. If a constant value is added to every observation of data, then arithmetic mean is obtained
a. Adding the constant
b. Dividing the constant
c. Subtracting the constant
d. Multiplying the constant
Correct Answer: a
24. A specific characteristic of a sample is called:
a. Statistic
b. Parameter
c. Constant
d. Variable
Correct Answer: a
25. A set of all units of interest in a study is called:
a. Population
b. Sample
c. Parameter
d. Statistic
Correct Answer: a
26. If the maximum value in a series is 25 and its range is 15, the maximum value of the series is:
a. 35
b. 10
c. 15
d. 25
Correct Answer: b
27. A number between 0 and 1 that is use to measure uncertainty is called
a. Probability
b. Simple event
c. Trial
d. Random variable
Correct Answer: a
28. The probability of an event cannot be:
a. Greater than zero
b. Equal to zero
c. Less than zero
d. Equal to one
Correct Answer: c
29. The elimination of extreme scores at the bottom of the set has the effect of:
a. None of the above
b. Lowering the mean
c. Raising the mean
d. No effect
Correct Answer: c
30. The probability of all possible outcomes of a random experiment is always equal to:
a. Infinity
b. All of the above
c. One
d. Zero
Correct Answer: c
31. Probability can be expressed as:
a. Ration
b. All of the above
c. Percentage
d. Fraction
Correct Answer: b
32. The result of no interest of an experiment is called:
a. Event
b. Constant
c. Failure
d. Success
Correct Answer: c
33. An arrangement of objects without regard to order is called:
a. Combination
b. Permutation
c. Sample point
d. Random experiment
Correct Answer: a
34. The elimination of extreme scores at the top of the set has the effect of:
a. No effect
b. Difficult to tell
c. Lowering the mean
d. Raising the mean
Correct Answer: c
35. A relationship where the flow of the data points is best represented by a curve is called:
a. Linear relationship
b. Linear positive
c. Linear negative
d. Nonlinear relationship
Correct Answer: a
36. The predicted rate of response of the dependent variable to changes in the independent variable is called:
a. Error
b. Regression equation
c. Slope
d. Intercept
Correct Answer: c
37. Ten families have an average of 2 boys. How many boys do they have together?
a. 12
b. 20
c. 2
d. 10
Correct Answer: b
38. If the value of any regression coefficient is zero, then two variables are:
a. Qualitative
b. Independent
c. Dependent
d. Correlation
Correct Answer: b
39. The dependent variable is also called:
a. Independent
b. Continuous variable
c. Regressand
d. Regression
Correct Answer: c
40. The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from:
a. Median
b. Geometric mean
c. Harmonic mean
d. Arithmetic mean
Correct Answer: d
41. The independent variable in a regression line is:
a. Qualitative variable
b. None of the above
c. Non-random variable
d. Random variable
Correct Answer: c
42. Step deviation method or coding method is used for computation of the:
a. Harmonic mean
b. Arithmetic mean
c. Geometric mean
d. Weighted mean
Correct Answer: b
43. When bXY is positive, then byx will be:
a. Negative
b. Zero
c. One
d. Positive
Correct Answer: d
44. If one regression coefficient is greater than one, then other will he:
a. Less than one
b. Equal to one
c. More than one
d. Equal to minus one
Correct Answer: a
45. The sum of the squares fo the deviations about mean is:
a. Maximum
b. Zero
c. All of the above
d. Minimum
Correct Answer: d
46. It is possible that two regression coefficients have:
a. Difficult to tell
b. Same signs
c. Opposite signs
d. No sign
Correct Answer: b
47. If the arithmetic mean of 20 values is 10, then sum of these 20 values is:
a. 10
b. 200
c. 20 + 10
d. 20
Correct Answer: b
48. If both variables X and Y increase or decrease simultaneously, then the coefficient of correlation will be:
a. Positive
b. Negative
c. Zero
d. One
Correct Answer: a
49. If one item is fixed and unchangeable and the other item varies, the correlation coefficient will be:
a. Zero
b. Undecided
c. Negative
d. Positive
Correct Answer: a
50. The sum of deviations taken from mean is:
a. Never equal to zero
b. Less than zero
c. Some times equal to zero
d. Always equal to zero
Correct Answer: d
