Chapter 4
The difference between the highest and lowest values in a distribution of scores is known as the
range
A symmetrical distribution has no variation.
False
Scores that have a small standard deviation are relatively inconsistent.
False
The standard deviation and IQR measure dispersion in the same way
False
For a somewhat normal distribution, the range is approximately equal to how many times the standard deviation:
6
The IQR is defined as
Q3-Q1
Standard deviation can only be used for variables measured at which level?
The interval level
Which of the following is the least accurate measure of variability?
The range
Dispersion is synonymous with variation
True
The higher the standard deviation the greater the variation.
True
The standard deviation is a more effective measure of variation than the range.
True
The standard deviation measures dispersion.
True
When comparing between the variability of two characteristics that are measured in different units, social researchers should use the coefficient of variation.
True
The range is useful for
estimating the standard deviation
Variability refers to
the spread of the sample scores.
Which of the following is a measure of variability?
the standard deviation
The average of the squared deviations is better known as
the variance
The standard deviation is a measure of
variability and dispersion
A synonym for variability is
width