Exam 2: Graphs,charts and Tablesdescribing Your Data

A histogram is an effective tool for graphically describing a joint frequency distribution.

When using Excel's Histogram option under the Data Analysis tool,the term bins refers to:

A pie chart is almost always constructed when the variable of interest is qualitative.

The following class limits would be acceptable for developing a frequency distribution on income:

Many Wal-Mart stores have automotive departments where customers can buy tires,have their vehicles serviced,and obtain other automotive services.Recently,the manager at an Ohio Wal-Mart collected data on the time customers had to wait to get the desired automotive service.Of the 500 cars in the sample,the shortest time any customer spent waiting was 3 minutes and the longest time was 183 minutes.Assuming that the manager wishes to develop a frequency distribution with 9 classes,which of the following would be an appropriate class width for each class?

Which of the following is an acceptable format for setting up class boundaries for a frequency distribution?

In constructing a scatter diagram

Explain why it is appropriate to connect the points on a line graph,but the points on a scatter plot should not be connected.

For the same data,a graph of a relative frequency distribution will look exactly the same as a graph of the frequency distribution.

Roscoe and Associates makes computer software for use in the telecommunications industry.Recently,managers at the company collected data for the year 2001 on three variables: total dollars spent on research and development,total sales dollars,and total employee salaries.To graphically present these three variables,the managers would be justified in using a line chart with all three variables plotted.

A study was recently conducted in which makers of toothpaste tracked sales for the month at different stores in a market area.The variable of interest was the number of units sold.The numbers ranged from 1,200 to 22,700.In this case,the stems in a stem and leaf diagram might be values such as 1 and 22 while the leaves would be 200 and 700.

Two separate frequency distributions for two variables provide the same information as one joint frequency distribution involving the same two variables.

A joint frequency distribution can be constructed for either quantitative or qualitative data.

A scatter diagram can be used to do which of the following?

Another name for a joint frequency distribution is a cross-tabulation table.

A study at State University involved an analysis of students' GPAs and the number of hours that they work at jobs off-campus.An appropriate graph to display the relationship between these two variables might be a scatter diagram.

If two variables are graphed on the same line chart,two separate scales are always required.

The undergraduate students at your university are classified as freshmen,sophomores,juniors,or seniors.A recent study of undergraduates asked the students to indicate the number of credits they were registered for this term.The responses were 3,6,9,12,15,and 18.The number of cells in a joint frequency distribution for the two variables,class standing,and credit hours is: