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Statistics Chapter 2 - Tabular and Graphical Methods
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What are the ways to display qualitative data?
Frequency Distribution
Relative frequency distribution
Bar graph
Pie Chart
What measurement scales apply to qualitative data?
Nominal
Ordinal
How can you display quantitative data?
Frequency distribution
Relative frequency distribution
Histogram
Cumulative distributions
What measurement scales apply to quantitative data?
Interval
Ratio
How many classes are typically in a frequency distribution?
5-20
How do you calculate the width of each class?
(largest data value - Smallest data value) / Number of classes
What is the class midpoint?
The value halfway between the lower and upper class limits
Example
: 10-14 (12)
What are the 4 rules of frequency distribution classes?
Classes can not overlap
Classes can not have breaks
Each data item must fit into only ONE class
Classes must have the same width
What is an open-end class?
A frequency distribution class that requires only a lower class limit or an upper class limit.
What is a symmetric skew?
Near perfect bell curve
What is a left or negative skew?
Longer tail to the left on a histogram.
What is a right or positive skew on a histogram?
Longer tail to the right.
What is the difference between a histogram and a bar graph?
A histogram has no spaces between each bar.
What is a cumulative distribution?
Each value represents the frequency of the current class plus the amounts of all previous classes.
What is a crosstabulation?
Tabular summary of 2 variables
The variables can be qualitative or quantitative
What are the relevant percentages for crosstabulations?
Row
Columns
What is Simpson's Paradox?
Conclusions based on aggregated data may be reversed when we look at unaggregated data.
On a scatter diagram, what does it mean when a trend line moves up from left to right?
Both values on the x and y axis are increasing
They have a correlation
What does it mean when a trend line moves down from left to right?
When x increases, y decreases.
There is still a correlation
What does it mean when there is a straight horizontal line?
The y value has no correlation to x.
Author
honestkyle
ID
197338
Card Set
Statistics Chapter 2 - Tabular and Graphical Methods
Description
Covers measurement scales and different kinds of frequency distributions
Updated
2013-04-11T16:17:41Z
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