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MATH 221 Week 2 Discussion Post
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MATH 221 Week 2 Discussion Post # 2 Professor Ramanathan Create a contingency table with two variables. Then pose two conditional probability questions for others to solve. Here is an example: Othe r students can reply with details on how to find the conditional probabilities. Red Green Blue TOTAL ...

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  • July 19, 2022
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  • 2021/2022
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  • math 221 week 2 discussion post

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MATH 221 Week 2 Discussion Post # 2
Professor Ramanathan
Create a contingency table with two variables. Then pose two conditional probability questions
for others to solve.
Here is an example: Other students can reply with details on how to find the conditional
probabilities.

Red Green Blue TOTAL

Large 10 2 18 30

Medium 12 16 4 32

Small 8 10 6 24

TOTAL 30 28 28 86



What is the P(blue|medium)? (4,28)
What is the P(small|green)? (10/28)
. The term contingency table was firstly used by Karl Pearson in "On the Theory of Contingency
and Its Relation to Association and Normal Correlation", part of the Drapers' Company Research
Memoirs Biometric Series I published in 1904.
In statistics, a contingency table (also known as a cross tabulation or crosstab) is a type of table
in a matrix format that displays the (multivariate) frequency distribution of the variables. These
are profoundly employed in survey research, business intelligence, engineering, and scientific
research. Contingency tables (also called crosstabs or two-way tables) are used in statistics to
summarize the relationship between several categorical variables. A contingency table is a
special type of frequency distribution table, where the results of two variables are shown side by
side simultaneously.




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