Chi Ap Stat

What is the value of the Chi-Square test statistic for GOF?

• 5.76

• 4.32

• 9.11

• 6.55

Think about the Chi-Square distribution (specifically the graph of it from your notes), can it take on negative values?

• Yes

• No

Think about the Chi-Square distribution (specifically the graph of it from your notes), do all Chi-Square curves look EXACTLY the same?

• Yes, it is like normal curves, they all look the same

• No, it's like t-curves, it is a family of curves which is why it has degrees of freedom

At a local high school, freshman, sophomores, and juniors are asked about a change in bell schedule for the next school year. The are given 2 options: The current schedule and a new revised schedule. A chi-square test to determine if the response to the question is independent of the class in which the student is a member. How many degrees of freedom would this test have?

• 6

• 2

• 3

• 4

For a Chi-squared test, with 2+ groups, what test is used?

• chi-squared GOF

• chi-squared independence

• chi-squared for homogeneity 

• linear regression t-test

Yesterday in the Webinar, I gave you a formula to figure out expected counts for ONE particular cell if you needed it. What was the formula? (You'll want to know this today)

• (row total * column total) / table total

• (cell total) / table total

What conclusion should be made based on the given data? We are trying to determine if there is an association between gender of a person and which is their dominant hand? (The null is always that they ARE INDEPENDENT - The alternate is always that they ARE NOT INDEPENDENT)

• This is convincing evidence that dominant hand and gender are not independent.

• They lack evidence to say that dominant hand and gender are not independent.

Run the chi-square test on your calculator based on the given data. What would be the p-value for the test?

• 0.36

• 3.2

• 0.007863

• 0.000495

What is the easiest way to get expected counts when working with Homogeneity and Independence?

• Use Matrices and Run the Test on the Calculator

• Use lists and Run the Test on the Calculator

An individual wants to run a chi-squared goodness of fit test to determine how students in three different education settings (lecture, group work, individual online work) performed on an exam in terms of pass/fail. How many degrees of freedom would you require for this GOF test?

• 2

• 1

• 3

• 5