Busn ch 2
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.
False
In a recent study of retail daily sales by stores at a mall in Kansas, the minimum daily sales was $700 and the maximum was $51,000. If you wish to construct a frequency distribution with 10 classes, the minimum class width would be $5,100.
False
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.
False
A cumulative frequency distribution shows the percentage of observations for the variable of interest with values less than or equal to the upper limit of each class.
False
A histogram can be used to display a joint frequency distribution between two quantitative variables.
False
A histogram is an effective tool for graphically describing a joint frequency distribution.
False
A joint frequency distribution is used to describe the number of occurrences where two observations in a data set have the same value.
False
A scatter diagram is a line graph without the points connected by a line.
False
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.
False
Frequency distributions are specifically for analyzing discrete data.
False
If a manager is interested in analyzing the relationship between the age of customers and the dollar volume of business that is done in the store, a relative frequency distribution would be most appropriate.
False
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.
False
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.
False
If you wish to construct a graph of a relative frequency distribution, you would most likely construct an ogive.
False
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.
False
In constructing a frequency distribution for the savings account balances for customers at a bank, the following class boundaries might be acceptable if the minimum balance is $5.00 and the maximum balance is $18,700: $0.00 - $5,000 $5,000 - 10,000 $10,000 - $15,000 $15,000 - $20,000
False
Once you have determined the class width using the formula, high-low divided by the number of classes, it is appropriate to round to the nearest integer to make the analysis easier.
False
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.
False
Scatter diagrams can be used for either quantitative or qualitative data.
False
The difference between bar charts and histograms is that bar charts always show percentage while histograms always show frequency.
False
The upper and lower limits of each class in a frequency distribution are also referred to as the data array.
False
There is no difference between cumulative frequency and relative frequency.
False
Two separate frequency distributions for two variables provide the same information as one joint frequency distribution involving the same two variables.
False
When choosing class boundaries for a frequency distribution, classes such as 60-70, 70-80, 80-90 would be acceptable.
False
When developing a bar chart, it is usually preferable to organize the bars in order from high to low
False
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
False
A histogram can be created for discrete or continuous data.
True
A joint frequency distribution can be constructed for either quantitative or qualitative data.
True
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.
True
A recent study of students at the university contained data on year in school and student age. An appropriate tool for analyzing the relationship between these two variables would be a joint frequency distribution.
True
A scatter diagram can show whether a pair of variables has a strong or weak relationship, and also whether it is linear or curved.
True
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
True
A study of 2000 Verizon cellphone customers listed the annual incomes of the customers as well as other variables. The lowest income was $25,000 and the highest income was $145,000. To develop a frequency distribution with 6 classes, the smallest value that the class width can be is 20K.
True
A tire store manager has collected data showing the number of tires of each brand sold during the past month. A bar chart might be effective in graphically illustrating which brands tend to sell best at this store.
True
An ogive is a graph that shows cumulative relative frequency.
True
Consider a situation in which both a frequency distribution and a relative frequency distribution have been developed for the same quantitative variable. If histograms are constructed from each distribution, the graphs will appear to have the same shape.
True
For the same data, a graph of a relative frequency distribution will look exactly the same as a graph of the frequency distribution.
True
In a study involving car owners, one question asked the owner for the number of miles driven last year. A second question asked the owner for the age of the vehicle. A joint frequency distribution would be useful for determining whether newer cars tend to be driven more miles than older cars.
True
In constructing a stem and leaf diagram, the stem and leaves are defined using a similar method to the definition of the bins of a histogram.
True
It is often a good idea to convert frequency distributions to relative frequency distributions when you wish to compare two distributions with different amounts of data.
True
On a scatter diagram, the independent variable should be placed on the horizontal axis and the dependent variable should be placed on the vertical axis.
True
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.
True
Sawyer & Company is a law firm in Dallas, Texas. Recently, the administrative manager prepared a report for the managing partners that showed the number of court cases handled by the firm monthly over the past three years. It was appropriate for her to use a line chart in this case.
True
The appropriate number of classes should generally be between 5 and 20
True
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.
True