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Exam 1: Describing Data With Graphs

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Question 41

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In general, incomes of employees in large firms tend to be:

A) skewed to the right
B) skewed to the left
C) symmetric
D) unknown

E) A) and D)
F) None of the above

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Question 42

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A highway department would like to repair a certain highway during the slowest part of a day to help minimize traffic congestion. Because it would be impossible to monitor the traffic flow on every day, they monitor how many vehicles pass on this highway during one particular day. Based on these results the department decides when to repair the highway. Describe the population and sample in this problem. Population: ________________________________________________________ Sample: ________________________________________________________

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All the traffic flow on all da...

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Question 43

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The stem-and-leaf plot is used to display the distribution of:

A bar chart in which the bars are ordered from smallest to largest is called a Pareto chart.

A discrete quantitative variable is one that can assume values only at specific points on an interval of values, with inevitable gaps between them.

Which of the following best describes a relative class frequency?

Which of the following statements is false?

Describe the difference between descriptive statistics and inferential statistics, and give an example for each.

A politician who is running for the office of governor of a state with 7 million registered voters commissions a survey. In the survey, 55% of the 10,000 registered voters interviewed say they plan to vote for her. The population of interest is the:

A relative frequency histogram can be constructed by letting the horizontal axis or the vertical axis represent the variable of interest.

The best type of chart for comparing two sets of qualitative data is:

Compared to the frequency distribution, the stem-and-leaf plot provides more details, since it can describe the individual data values as well as show how many are in each group, or stem.

Stem and leaf plots are often used to analyze qualitative data in most real life applications.

In a line chart, the horizontal axis represents time (such as months, years) and the vertical axis represents the value of the variable of interest.

Which of the following is not recommended when constructing a relative frequency histogram?

Persons or objects on which an experiment is performed are called experimental units.

A graphical portrayal of a relative frequency distribution of continuous quantitative data in such a way that lower and upper limits of data classes are identified by tick marks on a horizontal axis, while the corresponding relative class frequencies are represented by the areas of vertical rectangles connected to each other and stand on top of each of these class intervals, is called:

Which of the following statements is false?

A limnologist is studying a Minnesota lake in October. He records the temperatures in °C for surface water taken every other day at noon. The data are shown below. 8.5 8.1 7.9 9.0 7.7 7.3 7.1 6.8 9.2 6.8 6.3 7.0 6.5 5.7 5.9 4.9 4.2 6.9 a. Construct a stem and leaf plot to display the distribution of the data. b. Would you describe the distribution of the data as symmetric, skewed to the right or skewed to the left? ______________ c. Explain. ________________________________________________________

The most important and commonly graphical presentation of quantitative data is the: