Final answer:
The degrees of freedom (df) for a goodness-of-fit test is defined as df = k - 1, where k represents the number of categories.
Step-by-step explanation:
The degrees of freedom (df) for a goodness-of-fit test is defined as df = k - 1, where k represents the number of categories.
For example, if you are conducting a goodness-of-fit test with three categories, k = 3. Therefore, the degrees of freedom would be df = 3 - 1 = 2.
It's important to note that the expected value for each category should be at least five to ensure the validity of the test.