試題詳解

30. (5%) The following is a joint probability table between two categorical variables. the education level and the exercise frequency.
Which of the following statements is correct?
(A) If the table is from a large survey and can be treated as population data, we can say that the two variables are not independent
(B) If the table is derived from sample data, we can test the independence of the two variables using X² test. The alternative hypothesis for the test is the independence of the two variables
(C) If the table is derived from s sample data, the degree of freedom of the null distribution of the X²  test is 9
(D) If the table is derived from sample data, the x? test statistic for testing the independence of the two variables is
(E) TheX²  test assumes that the samples categorized into the same cell are correlated