Deck 2: Basic Concepts and Measures of Statistical Dispersion

Question 1

In a five number summary, which of the following is not used for data summarization?

A)the smallest value
B)the largest value
C)the median
D)the 25th percentile

Answer 1

D

Question 2

In statistics out of 100, marks of 21 students in final exams are as 90, 95, 95, 94, 90, 85, 84, 83, 85, 81, 92, 93, 82, 78, 79, 81, 80, 82, 85, 76, 85 then mode of data is

A)85
B)95
C)90
D)81

Answer 2

A

Question 3

Branches of statistics includes

A)applied statistics
B)mathematical statistics
C)industry statistics
D)both a and b

Answer 3

D

Question 4

What is the median of the data 78, 56, 22, 34, 45, 54, 39, 68, 54, 84?

A)54
B)53
C)55
D)51

Question 5

Find the mean of x + 77, x + 7, x + 5, x + 3 and x - 2?

A)x + 8
B)x + 18
C)x - 8
D)x - 18

Question 6

In the class intervals 40 - 50, 50 - 60, the number 50 is included in which of the following?

A)40 - 50
B)30 - 40
C)50 - 60
D)60 - 70

Question 7

If each observation of the data is increased by 5, then what happens to its mean?

A)is increased by 4
B)is increased by 5
C)is decreased by 4
D)is decreased by 5

Question 8

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

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

Question 9

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

A)Central tendency
B)Dispersion
C)Skewness
D)Symmetry

Question 10

The measures used to calculate the variation present among the observations in the unit of the variable is called:

A)Relative measures of dispersion
B)Coefficient of skewness
C)Absolute measures of dispersion
D)Coefficient of variation

Question 11

The measures used to calculate the variation present among the observations relative to their average is called:

A)Coefficient of kurtosis
B)Absolute measures of dispersion
C)Quartile deviation
D)Relative measures of dispersion

Question 12

The degree to which numerical data tend to spread about an average value called:

A)Constant
B)Flatness
C)Variation
D)Skewness

Question 13

The measures of dispersion can never be:

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

Question 14

If all the scores on examination cluster around the mean, the dispersion is said to be:

A)Small
B)Large
C)Normal
D)Symmetrical

Question 15

If there are many extreme scores on all examination, the dispersion is:

A)Large
B)Small
C)Normal
D)Symmetric

Question 16

Given below the four sets of observations. Which set has the minimum variation?

A)46, 48, 50, 52, 54
B)30, 40, 50, 60, 70
C)40, 50, 60, 70, 80
D)48, 49, 50, 51, 52

Question 17

Which of the following is an absolute measure of dispersion?

A)Coefficient of variation
B)Coefficient of dispersion
C)Standard deviation
D)Coefficient of skewness

Question 18

The measure of dispersion which uses only two observations is called:

A)Mean
B)Median
C)Range
D)Coefficient of variation

Question 19

The measure of dispersion which uses only two observations is called:

A)Range
B)Quartile deviation
C)Mean deviation
D)Standard deviation

Question 20

In quality control of manufactured items, the most common measure of dispersion is:

A)Range
B)Average deviation
C)Standard deviation
D)Quartile deviation

Question 21

The range of the scores 29, 3, 143, 27, 99 is:

A)140
B)143
C)146
D)70

Question 22

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

A)-48
B)40
C)-40
D)48