Exam 2: Graphs, Charts and Tablesdescribing Your Data

Assuming you have data for a variable with 2,000 values, using the 2k ≥ n guideline, what is the least number of groups that should be used in developing a grouped data frequency distribution?

Explain why a relative frequency histogram is sometimes preferable to a regular frequency histogram.

Which of the following is a false statement?

A scatter diagram is a line graph without the points connected by a line.

In constructing a histogram for a joint frequency distribution, the histogram will have the most meaning for the decision maker if there are no gaps between the bars on the histogram.

When a histogram is constructed for discrete numerical data, there should be spaces between the bars of the histogram.

In a report describing the number of people in the family of each of the 400 employees at a manufacturing company, the frequency count at the value 3 was 220. This means that the relative frequency at the 3 level is .44.

A professor wants to know if the amount of time her students spent working on a statistics assignment relates to the grade the student receives. She surveyed 10 students and recorded the data below. Which of the following statements is most correct?

In situations involving two or more variables, both histograms and bar charts can be used for multiple variables on the same graph.

Explain what information can be conveyed by a frequency histogram.

When using the Histogram tool in Excel to construct a frequency distribution and histogram, the bins represent the upper class limits.

Why should a histogram contain no gaps between the bars but a bar chart may have gaps?

A stem and leaf diagram is an alternative to using:

A bar chart is the same as a histogram.

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.

When developing a scatter diagram, it is appropriate to connect the points on the graph with straight lines or the lines can be omitted.

Which of the following is a key difference between a bar chart and a histogram?

A histogram can be constructed for data that are either quantitative or qualitative.

A frequency histogram should be computed from which type of data?

One of the differences between a stem and leaf diagram and a histogram is that even for variables involving a large number of different values, the stem and leaf diagram shows the individual data values whereas the histogram requires you to group the data and lose the individual values.