stats: chi-square test stat

• Dec 15th 2008, 08:37 PM
comet2000
stats: chi-square test stat
Solve the problem.

A coffeehouse wishes to see if customers have any preference among 5 different brands of coffee. A sample of 200 customers provided the data beolow. Calculate the chi-square test statistic χ² to test the claim that the probabilities show no preference.

Brand 1 2 3 4 5
Customers 30 55 65 18 32

how do i solve the problem?
• Dec 15th 2008, 08:44 PM
JeanetteR
If you have access to Excel, here's a tutorial on using it so you don't have to do the calc's by hand...which is explanatory at first and then painfully droll.

Also...

Vassar has some great links for online chi-test calculators.
One-Way Chi-Square
Contingency Table
• Dec 15th 2008, 08:57 PM
comet2000
Quote:

Originally Posted by JeanetteR
If you have access to Excel, here's a tutorial on using it so you don't have to do the calc's by hand...which is explanatory at first and then painfully droll.

Also...

Vassar has some great links for online chi-test calculators.
One-Way Chi-Square
Contingency Table

i need to know how to do it by hand.
• Dec 15th 2008, 10:18 PM
CaptainBlack
Quote:

Originally Posted by comet2000
Solve the problem.

A coffeehouse wishes to see if customers have any preference among 5 different brands of coffee. A sample of 200 customers provided the data beolow. Calculate the chi-square test statistic χ² to test the claim that the probabilities show no preference.

Brand 1 2 3 4 5
Customers 30 55 65 18 32

how do i solve the problem?

The expected frequencies if there is no difference in preference are all 50.

Now see here for the $\displaystyle \chi^2$ test.

CB