Chapter 3

As a measure of central tendency, the mean:

can often be used for more advanced statistical operations.

Which measure of central tendency is most appropriate for a skewed distribution?

median

The _____ is the score that occurs most frequently in a distribution.

mode

Which type of distribution of final grades would be most desirable to students?

negatively skewed

A distribution with a mean of 25, a median of 22.5, and a mode of 20, is said to be

positively skewed

A distribution can only have one mode.

False

A unimodal frequency distribution has two equal modes.

False

The median is used for variables measured at the nominal level.

False

Which measure(s) of central tendency can be applied to nominal data?

The mode

The median of a distribution is

the middlemost point

In a bimodal distribution of scores, central tendency is best measured by

the mode

In a negatively skewed distribution

the mode is larger than the mean.

In a positively skewed distribution

the mode is smaller than the mean.

A useful analogy for the meaning "average" is

the most frequent value

The mean cannot be meaningfully calculated for a nominal variable, such as gender.

True

The measures of central tendency one can use is determined by the variable's level of measurement.

True

The mode can be applied to any set of data at the nominal, ordinal, or interval level of measurement.

True

The Greek symbol ∑ represents the

sum

Deviation refers to

the distance of any score from the mean.

The median is defined as the middlemost point in a distribution.

true