# P-value @ ANOVA

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• #52376

BartW
Participant

Good day!
I have an exame in just one day and I try to finetune my statistic knowhow. But one thing I don´t know, and that is how to calculate a p-value when you’re working with ANOVA.
Here’s the question.
What is the P-value for the difference between the mean life span of the different type of batteries?
http://i40.tinypic.com/295ra6e.jpg  ( link for tabel )
MSA=875,783MSW=194,025  so F=4,51377And df1=3 and df2=16 But I don’t how to continue for the P-value.in the answer sheet they give 0,0178Could someone please help, it saves me a lot of frustration.
(and I apologize for my bad English, I’m Dutch)
GreetingsBart

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#184236

Mikel
Member

Go to the Fdist in Excel with a value of 4,51377 and fill in df of 3 and 16. You will see the value you referenced.
ANOVA uses the F distribution, Fdist is for when you have a calculated value and you want to know the probability.

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#184238

BartW
Participant

But is it also possible to calculate by hand? Because they asked in a previous exam when there was no Excel available. We only have a graphic computer (TI-84)

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#184247

Mikel
Member

You can interprolate from an F table.

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#184252

Craig
Participant

I can’t recall ever calculating the p-value by hand. (Used a table with interpolation as Stan mentioned, or obtained directly from software application). Seems like the technique they want you to use should be in the class notes.

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