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Exam 2: Graphs,Charts and Tablesdescribing Your Data

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Question 1

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

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Question 2

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A line chart is most appropriate for:

A) cross-sectional data.
B) nominal level data.
C) ordinal level data.
D) time-series data.

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Question 3

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The Grangeville Power Company has four classifications for its customers.For each customer classification,the company tracks the total amount of electricity used during the year.Which of the following types of graphs would be most appropriate to use?

One of the key differences between a bar chart and histogram is:

A stem and leaf diagram is most similar to a bar chart.

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

Joint frequency distributions are used to display:

In forming the classes for a frequency distribution and histogram,suppose there were a number of empty classes.You should:

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.

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

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

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 bar chart is the same as a histogram.

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.

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

Recently a survey was conducted in which customers of a large insurance company were asked to indicate the number of speeding tickets they had received in the past three years.The data in this case would most likely be analyzed using a frequency distribution with the data grouped into classes such as 0-2,3-5,6-8,etc.

A joint frequency distribution is used to describe the number of occurrences where two observations in a data set have the same value.

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

If you have constructed a joint frequency distribution manually and now wish to convert it to a joint relative distribution,the proper method is to divide each cell frequency by the cell's row total.