CH4
spread out or clustered together . size of most of the scores .
A measure of variability describes the degree to which the scores in a distribution are a)clustered together at one end of the range b)gathered in multiple widely separated peaks c)spread out or clustered together d)cluster together in the middle of the range Variability also measures the a)size of the distances between scores b)size of most of the scores c)change of frequency with distance from the center d)number of peaks or maximum frequencies of scores
12 2.0 6.5 4.5 clustered together within a range of two points
Calculate the range and interquartile range (IQR) for the following set of scores from a continuous variable: 5, 1, 6, 5, 4, 6, 7, 12 Range = IQR = The score that corresponds to the 75th percentile is The score that corresponds to the 25th percentile is The IQR is a better measurement of variability than the simple range because most of the scores are a)clustered together within a range of two points b)spread out between Xmin and Xmax
16 3
Calculate the range and interquartile range for the following set of scores from a continuous variable: 23, 13, 10, 8, 10, 9, 11, 12 Range = IQR =
Yes
Is it possible to obtain a negative value for SS (sum of squared deviations), variance, and standard deviation? No Yes
The mean of the squared deviations The square root of the variance
Variance is: The mean of the squared deviations The sum of squared deviation scores The sum of deviation scores The square root of the mean squared deviation score Standard deviation is: The square root of the variance The mean squared deviation score The sum of the squared deviation scores The mean deviation score
13, variables with precisely defined upper and lower bounds 14, measurements of a continuous variable
What is the range for the following set of scores? (You may have more than one answer.) 6, 12, 9, 17, 11, 4, 14 The range value a)12 b)13 c)15 works well for a)variables with precisely defined upper and lower bounds b)measurements of a continuous variable Another range value a)14 b)12 c)15 works well for a)variables with precisely defined upper and lower bounds b)measurements of a continuous variable
