The Chi-Squared Distribution

Question 1

Degrees of freedom?

Answer 1

Number of CLASSES (not n) - number of estimated parameters - 1

Question 2

What is essential about the intervals for expected frequency?

Answer 2

They must include the entire range of the theoretical distribution

(ie for an infinite distribution, you cannot finish on a class that is eg 70-79, must be 70-infinity)

Question 3

What must the minimum EXPECTED frequency be?

Answer 3

5

If not 5 then merge adjacent cells