121) The managers at Harris Pizza in Boston have tracked the tips received by their drivers along with the total bill to the customer. An appropriate graph for analyzing the relationship between these two variables is:
A) a scatter diagram.
B) a line chart.
C) a histogram.
D) a pie chart.
122) A scatter diagram can be used to do which of the following?
A) Determine the trend in a variable
B) Analyze the relationship between two variables
C) Describe the basic distribution for a quantitative variable
D) Show the percentage of a variable that is associated with each category into which that variable has been divided
123) In constructing a scatter diagram:
A) the independent variable should be on the vertical axis.
B) the independent variable should be on the horizontal axis.
C) the dependent variable should be on the horizontal axis.
D) It does not matter which variable goes on which axis.
124) Which of the following questions CANNOT be answered using a scatter diagram?
A) What is the trend over time of each of the 2 variables?
B) Is there a curved or linear relation between the 2 variables?
C) Is there a weak or strong relation between the 2 variables?
D) Is there a positive or negative relation between the 2 variables?
125) The sales manager at Western Furniture Company tracked data on the number of customers who came into the store each day and the total dollar volume of sales at the store during the same day. She is considering putting together a report for top management and wishes to show the relationship between these two variables. Which of the following graphs would likely be most useful? She has a sample of 36 days worth of data.
A) Scatter diagram
B) Bar chart
C) Frequency histogram
D) Pie chart
126) Consider the following chart. Which of the following statements is most correct?
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A) There is a negative linear relationship between the two variables.
B) There is a positive linear relationship between the two variables.
C) There is a perfect linear relationship between the two variables.
D) There is no apparent relationship between the two variables.
127) Consider the following chart. Which of the following statements is most correct?
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A) The values for the dependent variable are determined by the values for the independent variable.
B) The values in a scatter plot should be connected by a straight line.
C) The variable on the horizontal axis should be the independent variable.
D) A scatter plot like this one shows the trend in the data over time.
128) 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?
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
1415
1623
1934
1879
2102
2156
2511
2499
A) The proper graph for displaying these data is a pie chart.
B) There has been a gradual downward trend in these data.
C) A frequency histogram should be developed to help identify the trend in these data.
D) The data lend themselves to a line chart.
129) 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?
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
1415
1623
1934
1879
2102
2156
2511
2499
A) A histogram will illustrate whether a linear relationship exists between the number of visits and the week number.
B) A scatter diagram would be useful for displaying these data.
C) A line chart for these data will show that an upward trend in the number of visits to the club has occurred over two weeks.
D) None of the above
130) 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?
A) 9
B) 11
C) 13
D) 12