Question

What are the degrees of freedom corresponding to each of the following probabilities? You are required to draw a picture for every problem.

P(T > 2.763) = .005

P(T < –2.650) = .01

P(–1.313 < T < 1.313) = .80

Answer 1

P(T > 2.763) = .005

This is one tailed,

Look for column of 0.005 look for the value 2.763

Degrees of freedom is 28

P(T < –2.650) = .01

P(T < –2.650) = P(T > 2.650) = .01

This is one tailed,

Look for column of 0.01 look for the value 2.650

Degrees of freedom is 13

P(–1.313 < T < 1.313) = .80

This is two tailed

Look for column of 0.2 look for the value 1.313

Degrees of freedom is 28