Question

Use the t-distribution, sketch the curve and shade in the area that answers the question.

a) What is the P ( t > - 2.214 ) = ___________ when n = 19

b) What is the P ( t < _________ ) = .04 when n = 12

Answer 1

a) Given : n=19

Hence df=n-1=18

P( t > -2.214,df =18 )=P( t < 2.214 , df= 18) =0.98001

b) P( t < T ) = 0.04 for n=12 hence df = 11

From t table we get T= -1.928

Hence P( t < -1.928 )= 0.04 for df= 11