n 10 15 20 25 df CI 90 percent 90 percent 90 percent 90 perc

n: 10, 15, 20, 25

df: CI: 90 percent, 90 percent, 90 percent, 90 percent

: 10 percent, 10 percent, 10 percent, 10 percent

t*:

1. Find the appropriate degrees of freedom for the given sample size.

2. Find the approrpriate t* for the given confidence level and degrees of freedom.

Solution

Degrees of freedom is n-1

To find t* we use excel function tinv(0.1,df)