Hypothesis Tests Flashcards
What is the null hypothesis of a chi-square test?
H0: One variable is independent of the other variable
What are the steps to running a chi-square test of independence on your GDC?
- Create and name a matrix
- Run a X2 2-way Test.
How can you tell how many degrees of freedom your test will have?
You look at the number of rows and columns in the matrix (not including the totals).
degrees of freedom = (rows -1) * (columns -1)
OR
How do you find the expected frequency?
Multiply the two probabilities and the total number of students.
What is the critical value for a X2 test of independence?
It’s the cut-off point. It tells you where you make the decision to reject or not reject the null hypothesis.
How do you find the critical value on your GDC?
- Use the “inverse X2” feature of the GDC.
area = 1 - significance level.
How do you use the critical value to make a decision about your test (reject/not reject)?
Reject if statistic > critical value
How do you use the p-value to make a decision about your test (reject/not reject)?
Reject if p < significance level