Exam 2: Graphs, Charts and Tablesdescribing Your Data

Which of the following is a reason for constructing a joint frequency distribution?

Which of the following is true about the difference between stem and leaf diagrams and histograms?

A company has 400 employees. The manager of human resources has recorded the annual salary and wages for each employee. These value range from $17,500 to $67,800. Provide an example of a stem and a leaf that could be developed to describe the distribution of the salary and wage data.

In constructing and analyzing a scatter diagram, it is important to focus on the data points of interest by establishing appropriate scales for both the x and y axes. Otherwise, a nonlinear relationship can appear to be linear.

The regional sales manager for a medical supply company recently collected data on the reasons why customers returned the merchandise for a refund. She actually formed a frequency distribution for this variable. It would now be acceptable to construct a bar chart to graphically display the results.

Joint frequency distributions are used to display:

Which of the following is not considered desirable when constructing a frequency distribution for continuous data?

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.

In preparing a line chart, the horizontal axis shows time and the vertical axis shows the value of the variable of interest.

In a scatter plot the points should always be connected with a line.

The upper and lower limits of each class in a frequency distribution are also referred to as the data array.

Histograms cannot have gaps between the bars, whereas bar charts can have gaps.

A histogram is used to display which of the following characteristics for a quantitative variable?

At a manufacturing plant workers are divided into 4 different teams that rotate shifts. The number of units produced by each team is recorded. The best type of chart to display the data is a:

The appropriate number of classes should generally be between 5 and 20.

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

When developing a frequency distribution, the following bin classifications follow the definition of appropriate intervals of a variable: 0 to < 10 10 to < 20 20 to < 25

A study was recently done in which the brand preference for breakfast cereal was analyzed against the gender of the shopper. The study consisted of 200 male shoppers and 300 female shoppers. Three different cereal brands were considered: A, B, and C. A total of 250 female shoppers preferred brand A, 25 female shoppers preferred brand C. The number of female shoppers that preferred brand B was:

A histogram can be used to display a joint frequency distribution between two quantitative variables.

In analyzing a single quantitative variable, you will generally choose to use a scatter diagram if the variable is measured over time and a histogram if the variable is cross-sectional.