Chi Square Tests

If the p-value is less than the significance level...

• Reject Ho

• Fail to reject Ho

If the p-value is greater than the significance level...

• Reject Ho

• Fail to reject Ho

A traffic light is installed to allow traffic from a seldom used side street to cross a 4-lane highway. Because the side street doesn’t get a lot of traffic, the light is set to provide a red light for the side street 80% of the time, yellow 5% of the time, and green 15% of the time. Out of 200 cycles of the light, what is the expected number of red lights?

A traffic light is installed to allow traffic from a seldom used side street to cross a 4-lane highway. Because the side street doesn’t get a lot of traffic, the light is set to provide a red light for the side street 80% of the time, yellow 5% of the time, and green 15% of the time. Out of 200 cycles of the light, what is the expected number of yellow lights?

A traffic light is installed to allow traffic from a seldom used side street to cross a 4-lane highway. Because the side street doesn’t get a lot of traffic, the light is set to provide a red light for the side street 80% of the time, yellow 5% of the time, and green 15% of the time. Out of 200 cycles of the light, what is the expected number of green lights?

How do you calculate the degrees of freedom in a Test of Independence?

• Number of categories/groups - 1

• (rows - 1)(columns - 1)

• Ask Mrs. Krapf

How do you calculate the degrees of freedom in a Chi Square Goodness of Fit (GOF) test?

• Number of categories/groups - 1

• (rows - 1)(columns - 1)

• Ask Mrs. Krapf

What is the formula for the chi-square statistic?

A large chi-square means your data is ................... what is expected.

• close to

• far off from

What is the expected number of females that like to watch baseball?
Please do not round.