# Thread: table X

1. ## table X

if my X squared = 5.4
and my df = 5
How do I find p on the x table?
I have the answer here of about .3
How do you find this?

2. Originally Posted by Morgan82
if my X squared = 5.4
and my df = 5
How do I find p on the x table?
I have the answer here of about .3
How do you find this?
For df = 5, $\Pr(\chi^2 > 5.4) = 0.369$ (correct to three decimal places) actually.

Did you read my reply at this thread: http://www.mathhelpforum.com/math-he...6-p-value.html ? In particular, did you click on the hyper link?

3. Originally Posted by mr fantastic
For df = 5, $\Pr(\chi^2 > 5.4) = 0.369$ (correct to three decimal places) actually.

Did you read my reply at this thread: http://www.mathhelpforum.com/math-he...6-p-value.html ? In particular, did you click on the hyper link?
The following exchange of pm's is relevant to those interested in this thread:

Originally Posted by Morgan82 in a pm
Originally Posted by mr fantastic in a pm
Originally Posted by Morgan82 in a pm
thanks for all your help, but theres still somthing i was wondering if u could help me with.

df=5 P(X2>5.4)=.369

I have a table in my book. .369 is off the chart.
How do i find it just if i have the chart?
Morgan, Morgan, Morgan!

As I've said twice already ........ What you need is here: http://www.anu.edu.au/nceph/surfstat...tables/chi.php !!

Third time is the charm!

Regards.

MF

No No No!

Anyone can just type in the numbers.
I want to know how to find it on the table because for example, if I get a test and my teacher wont let me use a graphing calc.
I need to know how to do it the old fashion way.
Morgan, good as I am I'm not yet able to Vulcan mindmeld over the internet.

If you wanted to know how to do it [solely] from tables, then:
1. You should have clearly said so,
2. Ideally, you'd scan a copy of the tables you'll be using for us to look at.

If a value is not on your table, and you cannot access any other resource, then you're only chance is interpolation ..... Since it's obviously not linear interpolation (because the t-distribution is highly non-linear), it will require practice and experience.

Obviously if you're only using these tables to see if the p-value you get is significant, limited accuracy probably won't matter.

Certainly, if you have to do this in an exam, your instructor will obviously realise the shortcomings of the table and will cook the quesitons accordingly .....

Since this issue is of potential interest to other members reading the above-mentioned thread, I've posted this pm to that thread. Let me know if you're uncomfortable with this and I'll delete (or perhaps modify) it.

Best wishes for your studies.

Regards.

MF