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Exam 2: Visual Description of Data

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Question 41

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The difference between a histogram and a bar chart is that:

A) the histogram reflects qualitative data while the bar chart represents quantitative data.
B) the adjacent rectangles in a histogram have a gap while those for a bar chart do not.
C) the histogram reflects quantitative data while the bar chart represents qualitative data.
D) the adjacent rectangles in a bar chart have a gap while those for a histogram usually do not.
E) Both answers C and D are correct.

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Question 42

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Define and give a real or hypothetical example of cross-tabulation.

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In cross-tabulation,we express a count o...

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Question 43

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Which of the following is not a guideline for constructing a frequency distribution?

____________________ is also known as marginal or one-way tabulation.

The general manager of a chain of furniture stores believes that experience is the most important factor in determining the level of success of a salesperson.To examine this belief she records last month's sales (in $1,000s)and the years of experience of 10 randomly selected salespeople.These data are listed below. $\begin{array} { | c | c | c | } \hline \text { Salesperson } & \text { Years of Experience } & \text { Sales } \\\hline 1 & 0 & 7 \\2 & 2 & 9 \\3 & 10 & 20 \\4 & 3 & 15 \\5 & 8 & 18 \\6 & 5 & 14 \\7 & 12 & 20 \\8 & 7 & 17 \\9 & 20 & 30 \\10 & 15 & 25 \\\hline\end{array}$ Draw a scatter diagram of the data and determine the least squares regression line.

A requirement for a frequency distribution is that the set of classes must be mutually exclusive.This means that

The ____________________ is also known as the contingency table.