Chapter 2
If there are 130 values in a data set, how many classes should be created for a frequency histogram?
8
A ________ displays the frequency of each class with qualitative data and a ________ displays the frequency of each class with quantitative data. Barchart, Histogram Histogram, Barchart
Barchart, Histogram
A scatter plot can be used to identify outliers True or False
False
When data are qualitative, the bars should never be separated by gaps. True or False
False
When we wish to summarize the proportion (or fraction) of items in a class, we use the frequency distribution for each class. True or False
False
Pie chart
Graphical display of data in categories made up of pie slices. Each slice represents the frequency, relative frequency, or percent frequency of items in it's corresponding category
Which of the following divides quantitative measurements into classes and graphs the frequency, relative frequency, or percentage frequency for each class? Scatter plot Stem and leaf display Histogram
Histogram
Where does the class go on a bar chart?
Horizontal axis
Percent frequency distribution
Lists the percent frequency for each class
Frequency distributions
Tables that summarizes the number (or frequency) of items in each of several nonoverlapping classes (qualitative)
Pareto charts are frequently used to identify ________. The most common types of defects Random data Outliers that do not show up on a dot plot
The most common types of defects
stem and leaf display
This graph places the measurements in order from smallest to largest, and allows the analyst to simultaneously see all of the measurements in the data set and see the shape of the data sets distribution
A bar chart is a graphic that can be used to depict qualitative data. True or False
True
A runs plot is a form of scatter plot. True or False
True
A stem-and-leaf display is a graphical portrayal of a data set that shows the data set's overall pattern of variation. True or False
True
The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set. True or False
True
What is the relative and percent frequency of Papa Johns pizza if the sample size "n" is 50 and the frequency of the class is 19?
relative: 19/50= .38 percent: 38%
What is the relative and percent frequency of Brunos pizza if the sample size "n" is 50 and the frequency of the class is 8?
relative: 8/50= .16 percent: 16%
A histogram that has a longer tail extending toward smaller values is ________.
skewed to the left
A histogram that has a longer tail extending toward larger values is ________. skewed to the left skewed to the right
skewed to the right
general shape
the distribution is symmetrical/mound shaped
Where does the frequencies go on a bar chart?
vertical axis
What does the sum of relative frequencies in the relative frequency distribution always equal to?
1.0
What does the sum of percent frequencies in the percent frequency distribution always equal to?
100%
Pareto charts
A bar chart of the frequencies or percentages for various types of defects (used to identify opportunities for improvement) (highest-lowest)
Skewed to the right
A distribution having a long tail to the right
skewed to the left
A distribution shape having a long tail to the left
Scatter plot
A graph that can be used to study the relationship between two variables
Bar Chart
A graphical display of data in categories made up of vertical or horizontal bars
Dot Plots
A graphical portrayal of a data set that shows the data sets distribution by plotting individual measurements above a horizontal axis
Relative frequency distribution
A table that lists the relative frequency for each class
A plot that allows us to visualize the relationship between two variables is a(n) ________ plot.
Scatter
A stem-and-leaf display is best used to ________ Display a two-variable treemap Provide a point estimate of the variability of the data set Display the shape of the distribution
display the shape of the distribution1
Relative frequency
frequency of the class dived by "n"
