BESC 3010 CH 3.

Which of these measures of central tendency works for nominal variables?

Neither the mean nor the median works for nominal variables.

What is the mean for these data? 4, 2, 3, 6, 4, 5

4

What is the mean for these data? 3, 1, 2, 5+, 2, 4

Cannot be calculated

What is the minimum level of measurement needed to calculate the mean?

Interval

In a positively skewed distribution, which measure will generally have the highest value?

Mean

A frequency bar graph would be most appropriate for which measurement scales?

Nominal or ordinal

What is the minimum level of measurement needed to calculate the median?

Ordinal

When a histogram or polygon chart for a quantitative variable has two distinct peaks, then the distribution is referred to as _____.

bimodal

Which measure of central tendency is MOST affected by outliers?

mean

The three most common measures of central tendency are:

mean, median, mode

Which measure of central tendency is most appropriate for skewed distributions?

median

A normal distribution has a value of skewness that is _____.

near zero

What is the minimum level of measurement needed to calculate the mode?

nominal

Which measure of central tendency is always influenced by outliers?

the mean

Which of these measures is MOST affected by outliers?

the mean

When a histogram for a quantitative variable has only one distinct peak, then the distribution is referred to as...

unimodal

What is the median for these data? 5, 1, 1, 3, 2

2

What is the mode for the following data set? 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+

2

What is the median for the following data set? 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+

4

Which of these measures is LEAST affected by outliers?

median

Which measure of central tendency is LEAST efficient?

mode

Which measure of central tendency works for nominal variables?

mode

One visual difference between a bar chart and a histogram is that in a histogram...

the adjacent bars touch but in a bar chart they are separate.

What is the highest level of measurement?

the ratio

What is the median for these data? 3, 1, 2, 5+, 2, 4

2.5

In a negatively skewed distribution, which measure will generally have the highest value?

Mode

Which of the following measures of central tendency can be used with data on the ratio level of measurement?

The mean or the mode

What is the mode for these data?

2

For which levels of measurement can you calculate the mode?

Both ordinal and interval