Help with Stats please?

Question

If degree's of freedom is typed Student T Distrubtion?

P( t12 < 1.96)

Does it mean you should subtract one does the Student T distrubtion already mean one is taken off?




No rude comments please!

Answer 1

i don't understand your question?

I'm thinking that your asking whether a deduction of 1 from n, which gives the degress of freedom, means that you really subtract one from the sample size.

Actually, you really subtract one from the sample size.

But why?

degress of freedom determines the number of cases that is free to vary.

if n=1, your df=1-1 = 0

this means that the sample size has only one case or data and is not free to vary.
This is the explanation for a df=0.

if n=2, your df=1.

this means that there is one way your data can vary.

that's why you need to subtract one from the sample size to det the df.

Answer 2

All I remember is that I got it wrong on a midterm!