Unit 11 - Chi Square

Question 1

What is a typical null hypothesis for a goodness of fit test?

Answer 1

The model is correct or Outcomes occur with equal frequency.

Question 2

What is a typical null hypothesis for a chi square independence test?

Answer 2

There is no association betweeen __ and ___.

Question 3

What is a typical null hypothesis for a chi square test of homogeneity?

Answer 3

There is no difference betweeen the distributions of __ and ___.

Question 4

How do you find the degrees of freedom for a goodness of fit test?

Answer 4

of categories - 1

Question 5

How do you find the degrees of freedom for a chi square test of independence or homogeneity?

Answer 5

(Rows - 1)(Columns - 1)

Question 6

What is the purpose of a goodness of fit test?

Answer 6

To see if a distribution of a categorical variable matches a model distribution.

Question 7

What is the purpose of a chi square test of independence?

Answer 7

To see if there is an association between 2 categorical variables

Question 8

What is the purpose of a chi square test of homogeneity?

Answer 8

To see if the distributions of 2 populations are the same.

Question 9

What are the 3 conditions for a chi square test?

Answer 9

1. Random sample
2. Counts of categorical data
3. Expected counts > 5

Question 10

If you conduct a chi square test of independence and get a p-value of .0001, what conclusion would you make?

Answer 10

Reject Ho. There is sufficient evidence to suggest an association between ___ and ____.

Question 11

You conduct a goodness of fit test with null hypothesis: The game spinner is fair. You get a p-value of .1248. What conclusion do you draw?

Answer 11

Fail to reject Ho.