**1. **If Y = aX ± b, where a and b are any two constants and a ∦ 0, then the quartile deviation of Y values is equal to:

- a Q.D(X) + b
- ∣a∣ Q.D(X)
- Q.D(X) - b
- ∣b∣ Q.D(X)

Correct answer: (B)

∣a∣ Q.D(X)

∣a∣ Q.D(X)

**2. **For a symmetrical distribution:

- β
_{1}> 0 - β
_{1}< 0 - β
_{1}= 0 - β
_{1}= 3

Correct answer: (C)

β1 = 0

β1 = 0

**3. **The scatter in a series of values about the average is called:

- Central tendency
- Dispersion
- Skewness
- Symmetry

Correct answer: (B)

Dispersion

Dispersion

**4. **The measures of dispersion can never be:

- Positive
- Zero
- Negative
- Equal to 2

Correct answer: (C)

Negative

Negative

**5. **Which of the following is an absolute measure of dispersion?

- Coefficient of variation
- Coefficient of dispersion
- Standard deviation
- Coefficient of skewness

Correct answer: (C)

Standard deviation

Standard deviation

**6. **If the observations of a variable X are, -4, -20, -30, -44 and -36, then the value of the range will be:

- -48
- 40
- -40
- 48

Correct answer: (B)

40

40

**7. **If the maximum value in a series is 25 and its range is 15, the maximum value of the series is:

- 10
- 15
- 25
- 35

Correct answer: (A)

10

10

**8. **Mean deviation computed from a set of data is always:

- Negative
- Equal to standard deviation
- More than standard deviation
- Less than standard deviation

Correct answer: (D)

Less than standard deviation

Less than standard deviation

**9. **Which measure of dispersion has a different unit other than the unit of measurement of values:

- Range
- Standard deviation
- Variance
- Mean deviation

Correct answer: (C)

Variance

Variance

**10. **The positive square root of the mean of the squares of the cleviations of observations from their mean is called:

- Variance
- Range
- Standard deviation
- Coefficient of variation

Correct answer: (C)

Standard deviation

Standard deviation