A two-way table presents categorical data by counting the number of observations

Question

A two-way table presents categorical data by counting the number of observations that fall into each group for two variables, one divided into rows and the other divided into columns. For example, suppose a survey was conducted of a group of 20 individuals, who were asked to identify their hair and eye color. A two-way table presenting the results might appear as follows Eye Color Green BrownBlack Total Hair Color Blue Blonde Red Brown Black 1 2 2 10 4 3 20 Total What is the probability that one has blue eye color?

Explanation / Answer

Probability that one has blue eye colour is

= Number of individuals with blue eye colour / total number of individuals.

= 5/20

= 0.25

So probability that one has blue eye colour is 0.25

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