The mean and variance of a chi-square distribution with degrees ...

[daltonest1984]

The mean and variance of a chi-square distribution with  degrees of freedom is determined by the number of degrees of freedom.
 
  Indicate whether the statement is true or false

Question 2

What is the rationale for df = (r - 1 )(c - 1 ) in conducting a chi-square test of independence for a contingency table with r rows and c columns?
 
  What will be an ideal response?

[tandmlomax84]

Answer to Question 1

TRUE

Answer to Question 2

The rationale for df = (r - 1 )(c - 1 ) is that this quantity represents the number of cell frequencies that are free to vary. Given that we know the sample size (the total number of observations in the table), we need to know the contents of (r - 1 ) rows and (c - 1 ) columns in order to completely fill in the cells within the r  c table.

[daltonest1984]

Thank you

[tandmlomax84]

No problemo