Statistics

111. If the variance of a dataset is 84, what is its standard deviation?

• A 9.17 Correct answer
• B 18.33
• C 4.58
• D 12.17

112. If the variance of a dataset is 4, what is its standard deviation?

• A 2.00 Correct answer
• B 4.00
• C 1.00
• D 5.00

113. If every value in a dataset is increased by 32, what happens to the standard deviation?

• A Increases by 32
• B Decreases by 32
• C Remains unchanged Correct answer
• D Multiplied by 32

114. If every value in a dataset is increased by 12, what happens to the standard deviation?

• A Increases by 12
• B Decreases by 12
• C Remains unchanged Correct answer
• D Multiplied by 12

115. In a moderately asymmetrical distribution, if the mean is 64 and the median is 62, what is the approximate value of the mode?

• A 58 Correct answer
• B 62
• C 54
• D 66

116. If every value in a dataset is multiplied by 5, how does the standard deviation change?

• A Remains unchanged
• B Increases by 5
• C Multiplied by 5 Correct answer
• D Multiplied by 25

117. The standard deviation of a set of 30 identical observations (e.g., all values are 25) is equal to:

• A 25
• B 0 Correct answer
• C 1
• D Cannot be determined

118. In a moderately asymmetrical distribution, if the mean is 44 and the median is 42, what is the approximate value of the mode?

• A 38 Correct answer
• B 42
• C 34
• D 46

119. The sum of deviations of a set of 36 observations from their arithmetic mean is always:

• A Zero Correct answer
• B Positive
• C Negative
• D Sum of observations

120. The standard deviation of a set of 10 identical observations (e.g., all values are 5) is equal to:

• A 5
• B 0 Correct answer
• C 1
• D Cannot be determined