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Course: Statistics and probability > Unit 1
Lesson 2: Two-way tables- Two-way frequency tables
- Read two-way frequency tables
- Create two-way frequency tables
- Create two-way relative frequency tables
- Analyze two-way frequency tables
- Interpret two-way tables
- Trends in categorical data
- Two-way relative frequency tables and associations
- Two-way tables review
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Two-way frequency tables
Learn how to read and use two-way frequency tables.
Let's jump right in and look at a two-way frequency table that came from asking students whether they prefer cats or dogs.
Preference | Male | Female |
---|---|---|
Prefers dogs | ||
Prefers cats | ||
No preference |
The columns of the table tell us whether the student is a male or a female. The rows of the table tell us whether the student prefers dogs, cats, or doesn't have a preference.
Notice that there are two variables-- gender and preference-- this is where the two in two-way frequency table comes from.
The cells tell us the number (or frequency) of students. For example, the is in the male column and the prefers dogs row. This tells us that there are male students who prefer dogs.
Row and column totals
To find the number of students that prefer cats, we just add up the number of students in the prefers cats row:
Preference | Male | Female |
---|---|---|
Prefers dogs | ||
Prefers cats | ||
No preference |
Let's practice!
Problem 1
Problem 2
Problem 3
Challenge problem
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