Chapter 2 Greenville

The proper way to construct a stem-and-leaf display for the data set {62, 67, 68, 73, 73, 79, 91, 94, 95, 97} is to

• exclude a stem labeled ‘8’.

• include a stem labeled ‘8’ and enter no leaves on the stem.

• include a stem labeled ‘(8)’ and enter no leaves on the stem.

• include a stem labeled ‘8’ and enter one leaf value of ‘0’ on the stem.

The sum of frequencies for all classes will always equal

• 1.

• the number of elements in a data set.

• the number of classes.

• a value between 0 and 1.

A researcher is gathering data from four geographical areas designated: South = 1; North = 2; East = 3; West = 4. The designated geographical regions represent

• categorical data.

• quantitative data.

• crosstabular data.

• either categorical or quantitative data.

Histograms based on data on housing prices and salaries typically are

• skewed to the left.

• skewed to the right.

• stacked.

• symmetric.

In quality control applications, bar charts are used to identify the most important causes of problems. When the bars are arranged in descending order of height from left to right with the most frequently occurring cause appearing first, the bar chart is called a

• Cause-and-effect diagram.

• Ogive.

• Pareto diagram.

• Stacked bar chart.

The sum of the relative frequencies for all classes will always equal

• the sample size.

• 100%.

• one.

• any value larger than one.

Of those students who are planning on going to graduate school, what percentage are majoring in engineering?

• 10.5

• 28.8

• 30.0

• 40.4

A tabular summary of a set of data showing the fraction of the total number of items in several classes is a _____ distribution.

• frequency

• relative frequency

• cumulative relative frequency

• cumulative frequency

The percentage of students who work at least 20 hours per week is

• 25%.

• 50%.

• 75%.

• 100%.

The difference between consecutive lower class or upper class limits of adjacent classes provides the

• number of classes.

• class limits.

• class midpoint.

• class width.