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Business Statistics

Statistics

Quiz 2 :

Descriptive Statistics and Analytics: Tabular and Graphical Methods

Quiz 2 :

Descriptive Statistics and Analytics: Tabular and Graphical Methods

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A scatter plot can be used to identify outliers.
Free
True False
Answer:

Answer:

False
Explanation: A scatter plot is used to identify the relationship between two variables.

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Beginning the vertical scale of a graph at a value different from zero can cause increases to look more dramatic.
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True False
Answer:

Answer:

True
Explanation: This can cause extreme interpretations at first; it is always important to note on your graph what value you are beginning with on your graph.

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The relative frequency is the frequency of a class divided by the total number of measurements.
Free
True False
Answer:

Answer:

True
Explanation: This is used when we wish to summarize the proportion (or fraction) of items in each class.

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A runs plot is a form of scatter plot.
True False
Answer:
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The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set.
True False
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Stem-and-leaf displays and dot plots are useful for detecting outliers.
True False
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When we wish to summarize the proportion (or fraction) of items in a class, we use the frequency distribution for each class.
True False
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When establishing the classes for a frequency distribution, it is generally agreed that the more classes you use the better your frequency distribution will be.
True False
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It is possible to create different interpretations of the same graphical display by simply using different captions.
True False
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Each stem of a stem-and-leaf display should be a single digit.
True False
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The cumulative frequency for a class will always be at least as large as the cumulative frequency for any class with a smaller upper boundary.
True False
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A frequency table includes row and column percentages.
True False
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When constructing a graphical display that utilizes categorical data, classes that have frequencies of 5 percent or less are usually combined together into a single category.
True False
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In a Pareto chart, the bar for the "Other" category should be placed to the far left of the chart.
True False
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In the first step of setting up a Pareto chart, a frequency table should be constructed of the defects (or categories) in decreasing order of frequency.
True False
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Splitting the stems refers to assigning the same stem to two or more rows of the stem-and-leaf display.
True False
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A stem-and-leaf display is a graphical portrayal of a data set that shows the data set's overall pattern of variation.
True False
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When data are qualitative, the bars should never be separated by gaps.
True False
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A bar chart is a graphic that can be used to depict qualitative data.
True False
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When looking at the shape of the distribution using a histogram, a distribution is skewed to the right when the left tail is shorter than the right tail.
True False
Answer:
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