The F-distribution table - how to use

The F-distribution table - how to use

t-distribution tablet

How to use the F-table


The first, left column is the df (degrees of freedom) of the denominator of the F ratio, (also called the error term.
The first, top line is the degrees of freedom of the numerator of the F ratio.
Example: In an experiment with 3 groups, of 10 subjects each, we have df between 2, and df within 27.
Suppose that we analyzed our data using ANOVA and we found an F=12.54. We call this the computed F.
Now we enter the F table. Place your finger on the first left column at 27, then draw your finger to the third column which has the heading 2. You read the value 3.354 We call this the required F.

Now you compare your computed F which was F=12.54 to the required F of this table which is 3.354 Your computed F is bigger, so the finding of your experiment is significant,"p<0.05".
In scientific reports, we always report this p value.

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Comments

F- distribution and t-distribution, I sense a continuity between the two.

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correct, there is funny story in the book re normal curve, t, and F.

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What does p less than 0.05 mean?

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That the difference between the means is not chance, that it is the result of our treatment.

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What is treatment?

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What you do to the subjects.

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Compare normal, t, f distr?

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Beauty variations on a theme...

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