**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__