Question

Consider a t distribution with 15 degrees of freedom. Compute P(-1.42<t<1.42). Round your answer to at least three decimal places.

Consider a t distribution with 30 degrees of freedom. Find the value of c such that P( t >C)=0.10. Round your answer to at least three decimal places.

P(-1.42<t<1.42)=

C=

Answer 1

1)from excel :

P(-1.42<t<1.42) =1-tdist(1.42,15,2) =0.824

2)

from excel C =tinv(0.1*2,30)=1.310