- #1
Phox
- 37
- 0
Homework Statement
Let X1, X2,...,X16 be a random sample of size 16 from N(μ=50, σ2=100) distribution.
Find P(Xbar > 50 + .6505(s))
Homework Equations
Z= (xbar - μ)/(σ/√n)
The Attempt at a Solution
So I know the solution of this problem is given by P( T(15 d.f.) > 2.602 ) but I'm not sure why.
I notice that you get the value 2.602 by plugging (50 + .6505(s)) in for xbar in the Z equation.
I guess I'm not really sure why we use the T distribution here and how you're supposed to come up with the value 2.602. 15 degrees of freedom makes sense.