Statistics

121. The sum of deviations of a set of 16 observations from their arithmetic mean is always:

122. The first moment about the mean (first central moment) is always equal to:

123. The second central moment (moment about the mean) is equivalent to which of the following?

124. If the third central moment is negative, the distribution is:

125. If a distribution has kurtosis coefficient beta_2 (or b2) greater than 3, the distribution is called:

126. If the variance of a dataset is 44, what is its standard deviation?

127. If every value in a dataset is increased by 22, what happens to the standard deviation?

128. In a moderately asymmetrical distribution, if the mean is 54 and the median is 52, what is the approximate value of the mode?

129. The standard deviation of a set of 20 identical observations (e.g., all values are 15) is equal to:

130. The sum of deviations of a set of 26 observations from their arithmetic mean is always:

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