Exam 2: Graphs,Charts and Tablesdescribing Your Data

In a recent study at First National Bank,a frequency count was made for the variable marital status for the bank's 10,000 customers.It would also be appropriate to develop a histogram for this variable to show how marital status is distributed.

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.

The Carter Department Store has data on the sales volume by department for the past 200 days.The data are in an Excel spreadsheet where column A represents the department name and column B represents the sales for each day in that department.In order to construct a bar chart that illustrates the difference in total sales by department for the 200 days,a required step in Excel will be to:

There is no difference between cumulative frequency and relative frequency.

If two variables show a positive linear relationship in a scatter diagram:

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 Maple Grove Hotel manager has collected data on the number of rooms occupied each evening for the past 700 nights.The fewest rooms occupied during that period was 11 and the most was the capacity,430.Based on this information,which of the following would be reasonable class limits for the first class if the manager wishes to use 8 classes to develop a frequency distribution?

The Fitness Center manager has collected data on the number of visits to the club each week for the past 8 weeks.These data are shown as follows.Which of the following statements is most correct?

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

Explain what information can be conveyed by a frequency histogram.

A scatter diagram can show that the relationship between two variables is actually nonlinear.

A stem and leaf diagram is more appropriate for graphically displaying a joint frequency distribution than is a histogram since the stems can be used to display one variable while the leaves can be used to display the second variable.

Bar charts can typically be formed with the bars vertical or horizontal without adversely affecting the interpretation.

The Canyon Water Company collects data on the number of gallons of water consumed during a month for each customer.The production manager has divided the usage into 6 classes.To display these data effectively,she could use which of the following types of graphs to convey information about the water usage?

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

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:

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

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

A major insurance company believes that for drivers between 16 years of age and 60 years of age,the number of accidents per year tends to decrease as age increases.If this is the case,a scatter diagram should show a negative relationship between the two variables.

If the Viking Sales Company plans to display the sales for each of its six major products for the year 2001,an effective chart to do this would be a histogram.