chi-square distribution tables...help!?

Question

How do you use this table? I have to find a x2 value that has an area of .95 to its right...how do i figure out how to obtain that value?? The exact question reads: For a X2(squared)-curve with 19 degrees of freedom, find the x2(squared) value that has area 0.95 to its right....

Answer 1

Short answer:
x² = 10.12

So we're on the same page, take a look at this one:

http://www.stat.purdue.edu/~yuzhu/stat514s05/Tables/table3.jpg

•The numbers down the far-left column (labeled 'ν', greek letter nu) are the degrees of freedom.
•The numbers along the top row (labeled 'α') are the area under the curve to the right of a particular x².
•The values in the table are the x² values themselves.

So to read the table:
1) Find your degrees of freedom in the far-left column (19)
2) Find your α in the top row (0.95)
3) Now find the x² value in the row of ν=19 and in the column of α=0.95 ───► x²=10.12

Note:
Sometimes you are interested in a quantity labeled x²v. This is just your x² divided by your degrees of freedom. In this case (x²=10.12, v=19), your x²v = 0.532.

Answer 2

Can't give you the answer as I don't have the table you have.

But, here is a web page that describes the process and has lots of links to explain further.

Best of luck

Answer 3

10.117