Mean deviation is always ________.

• A) negative
• B) less then standard deviation
• C) equal to standard deviation
• D) more than standard deviation

The moving averages represent ------------------

• A) Time series variations
• B) Co-efficient of variations
• C) Absolute deviation
• D) Statistical Dispersion

The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation?

• A) 3%
• B) 35.7%
• C) 4%
• D) 27.8%

Scatterplots, like histograms, are a good visual means to understanding patterns of

• A) Trivariate numerical data
• B) univariate numerical data
• C) None of these
• D) bivariate numerical data

For a data, mean is equal to median then its distribution is

• A) asymmetrical
• B) right asymmetrical
• C) left asymmetrical
• D) symmetrical

For a data, mean < median then its distribution is

• A) left asymmetrical
• B) asymmetrical
• C) symmetrical
• D) right asymmetrical

In case of variance, for the sample, the sum of squares of the deviations is divided by

• A) One more the number of values in the population i-e (N+1)
• B) One less the number of values in the population i-e (N-1)
• C) Exactly the number of values in the population i-e N
• D) Two more the number of values in the population i-e (N+2)

The measure of degree of dependence of one variable to the other independent variable is called

• A) b)Correlation
• B) d)None of these
• C) a)Regression Coefficient
• D) c)Both (a) and (b)

The equation of the regression line is 2y + 5x – 3 = 0. What will be the slope and intercept of the line?

• A) slope = -5, intercept = 3
• B) slope = -2.5, intercept = 1.5
• C) slope = 5, intercept = -3
• D) slope = 2.5, intercept = -1.5

If COV(X,Y)=0

• A) None of these
• B) The variables are independent
• C) The variables are dependent
• D) The result is inconclusive

If the regression line: Y= 3+5X meets the x-axis at ‘8’ unit from the origin then the value of y-intercept is

• A) -37
• B) -8
• C) 8
• D) 43

If y=2+0.6x then value of y-intercept is

• A) 0
• B) 1.2
• C) 2
• D) 0.6

In the relationship between height and educational qualification

• A) the height is independent and education is dependent variable
• B) none of the given choices
• C) the height is dependent and education is independent variable
• D) there is inverse relationship between the two

If a = 2 , b = 1 , independent variable = 4 then dependent variable
for an estimating regression line is

• A) 2
• B) 6
• C) none of the given choices
• D) 4

Which one measures the degree of association between two variables?

• A) Correlation coefficient
• B) Standard deviation
• C) Covariance
• D) Median

Which of the following correlation coefficients represents the weakest correlation between two variables?

• A) 0.15
• B) 0.02
• C) -0.15
• D) -1.00

In simple regression the number of unknown constants are ……

• A) Two
• B) Three
• C) One
• D) Four

If the standard deviation of a population is 9, the population variance is:

• A) 9
• B) 3
• C) 21
• D) 81

If the CORRELATION function returns the #DIV/0 ! error value, what is the possible reason of the error?

• A) Array or reference argument contains text, logical values or empty cells.
• B) The arguments are names, arrays, or references that contain numbers.
• C) Either Array1 or array2 is empty.
• D) Array1 and Array2 have different number of data points.

The coefficient of variation for a set of annual incomes is 18%; the coefficient of variation for the length of service with the company is 29%. What does this indicate?

• A) Dispersions are equal
• B) More dispersion in the distribution of the incomes compared with the dispersion of their length of service
• C) Dispersion in the two distributions (income and service) cannot be compared using percents
• D) More dispersion in the lengths of service compared with income