Chapter 11.3

Question 1

What is a contingency table?

Answer 1

it’s a table in which frequencies are classified according to two variables: one for rows and another for columns

pg. 593

Question 2

What is a test for idependence?

Answer 2

It test the null hypothesis(Hsub0) that in a contingency table, the row and column varables are independent(not related)

pg. 593

Question 3

How do you do a test for independence on the TI-84?

Answer 3

2nd Matrix
Edit
dimentions of the matrix(row x columns)
enter matrix frequencies
Stat
Tests
x^2-Test
Calculate
shows X^2, P-value, degrees of freedom

pg. 594

Question 4

What is the null hypothesis/Hsub0 for a test for independence?

Answer 4

It is always that the row and column variables are independent

pg. 595

Question 5

How do you know how to answer the claim?

Answer 5

if the claim is that the row and column variables are independent then the claim matches Hsub0
if the claim is that the row and column variables are DEPENDENT/ Not independent then the claim does NOT match Hsub0

pg. 596

Question 6

What is the wording for the final conclusion flow chart?

Answer 6

Does the claim say independent?-yes-reject Hsub0?-yes-reject
Does the claim say independent?-yes-reject Hsub0?-no-not reject
Does the claim say independent?-no-reject Hsub0?-yes-support
Does the claim say independent?-no-reject Hsub0?-no-not support

pg. 597

Question 7

What are the test directions for findng a test for independence?

Answer 7

a) find x^2
b) find critical value
c) P-value
d) Reject H0 or Fail to reject H0
e) State the conclusion

pg. 597