LabBench Activity

Using the Chi-Square Critical Values Table

The chi-square critical values table provides two values that you need to calculate chi-square:

Use the critical values table here to do the problems below. *

Degrees of Freedom (df)
Probability (p) 1 2 3 4 5
0.05 3.84 5.99 7.82 9.49 11.1
0.01 6.64 9.21 11.3 13.2 15.1
0.001 10.8 13.8 16.3 18.5 20.5

1. Determine the degrees of freedom. This is the number of categories (red eyes or sepia eyes) minus one. For the data in Case 1, the number of degrees of freedom is

2. Find the probability (p) value for 1 degree of freedom in the 0.05 row.