Deck 8: Statistics and Data Analysis

Question 1

The suitable average for averaging the shoe sizes for children is:

A)Mean
B)Median
C)Mode
D)Geometric mean

Answer 1

Mode

Question 2

What is the value of the first quartile for observations 15, 18, 10, 20, 23, 28, 12, 16?

A)17
B)16
C)12.75
D)12

Answer 2

16

Question 3

The measurements of spread or scatter of the individual values around the central point is called:

A)Measures of dispersion
B)Measures of skewness
C)Measures of central tendency
D)Measures of kurtosis

Answer 3

Measures of dispersion

Question 4

The smaller the variance the less spread of the data around the mean

A)True
B)False
C)none
D)all

Question 5

The measures of dispersion can never be:

A)Positive
B)Negative
C)Zero
D)equal to 2

Question 6

The mean deviation is minimum when deviations are taken from:

A)Mean
B)Median
C)Mode
D)None of these

Question 7

Which of the following is a unit free measure of dispersion:

A)Range
B)Standard deviation
C)Interquartile range
D)Coefficient of range

Question 8

The standard deviation is independent of:

A)Change of scale
B)Change of origin
C)Change of origin and scale
D)None of these

Question 9

In order to compare two series we can use

A)Coefficient of Variation
B)Standard deviation
C)Coefficient of Skewness
D)Coefficient of kurtosis

Question 10

If the values of mean, median and mode coincide in a unimodal distribution, then the distribution will be:

A)Positively Skewed
B)Symmetrical
C)Negatively Skewed
D)None of these

Question 11

The degree of peaked ness or flatness of a unimodal distribution is called:

A)Skewness
B)Kurtosis
C)Dispersion
D)Normal distribution

Question 12

Following are the Relative measures of dispersion except

A)Co-efficient of Mean deviation
B)Standard deviation
C)Co-efficient of Range
D)Co-efficient of Quartile deviation

Question 13

For a symmetrical distribution Q1=25, Q3=45, the median is

A)20
B)25
C)35
D)None of these

Question 14

The coefficient of variation cannot be meaningfully used to compare the variability of two or more sets of data, when

A)The standard deviation is zero for one or more sets of data
B)The standard deviation is 1 for one or more sets of data
C)The mean is zero for one or more sets of data
D)The mean is 1 for one or more sets of data

Question 15

Standard deviation is always computed from

A)Mean
B)Median
C)Mode
D)geometric mean

Question 16

Which of the following is true, if there is no dispersion in a data set:

A)All the mathematical and positional averages are equal.
B)All the mathematical averages are equal but the positional averages are not equal
C)All the mathematical averages are equal to zero
D)None of these

Question 17

For a distribution of data, if the arithmetic mean> median>mode, then which of the following is true?

A)The distribution is symmetrical
B)The distribution is positively skewed
C)The distribution is negatively skewed
D)None of these

Question 18

Correlation analysis is a ..............................

A)Univariate analysis
B)Bivariate analysis
C)Multivariate analysis
D)Both Bivariate and Multivariate analysis

Question 19

If one of the regression coefficients is greater than unity, the other must be:

A)More than Unity
B)Less than Unity
C)Unity
D)all

Question 20

If all the points of a scatter diagram lie on a straight line falling from left upper corner to the right bottom corner, the correlation is called...................

A)Zero correlation
B)High degree of positive correlation
C)Perfect negative correlation
D)Perfect positive correlation

Question 21

The rank correlation coefficient was discovered by....................................

A)Fisher
B)Spearman
C)Karl Pearson
D)Bowley

Question 22

If the regression line is Y on X, then the variable X is known as..........................

A)Independent variable
B)Explanatory variable
C)Regressor
D)All the above

Question 23

The point of intersection of two regression lines is..........................

A)(0,0)
B)(1,1)
C)(x,y)
D)(x̄, ӯ)

Question 24

If r = ± 1, the two regression lines are...............................

A)Coincident
B)Parallel
C)Perpendicular to each other
D)None of these

Question 25

If bxy and byx are two regression coefficients, they have:

A)Same signs
B)Opposite signs
C)Either a or b
D)None of the above.