In a dataset to answer this question, how many of
the variables are categorical?
(a)
0
(b)
1
(c)
2
Whether the movie is a comedy
or a drama is categorical.

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Hollywood Movies
Do movies that are comedies tend to get higher
audience ratings than movies that are dramas?
In a dataset to answer this question, how many of
the variables are quantitative?
(a)
0
(b)
1
(c)
2
Audience rating is quantitative.

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Kidney Cancer
Source: Gelman et. al. Bayesian Data Anaylsis
, CRC Press, 2004.
Counties with the highest kidney cancer death rates

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Kidney Cancer
Counties with the lowest kidney cancer death rates

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Kidney Cancer
If the values in the kidney cancer dataset are
rates of kidney cancer deaths, then what are
the cases?
(a)
The people living in the US
(b)
The counties of the US
A person either has kidney cancer or doesn’t… a rate
must apply to a group of people, such as a county

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Kidney Cancer
If the values in the kidney cancer dataset are
yes/no, then what are the cases?
(a)
The people living in the US
(b)
The counties of the US
A person either has kidney cancer or doesn’t.