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## Quiz 2 : Descriptive Statistics and Analytics: Tabular and Graphical Methods

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

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

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

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.

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

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

A runs plot is a form of scatter plot.
True False
The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set.
True False
Stem-and-leaf displays and dot plots are useful for detecting outliers.
True False
When we wish to summarize the proportion (or fraction) of items in a class, we use the frequency distribution for each class.
True False
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
It is possible to create different interpretations of the same graphical display by simply using different captions.
True False
Each stem of a stem-and-leaf display should be a single digit.
True False
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
A frequency table includes row and column percentages.
True False
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
In a Pareto chart, the bar for the "Other" category should be placed to the far left of the chart.
True False
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
Splitting the stems refers to assigning the same stem to two or more rows of the stem-and-leaf display.
True False