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n: 10, 15, 20, 25 df: find 1-a: 90 percent, 90 percent, 90 percent, 90 percent...

n: 10, 15, 20, 25 df: find 1-a: 90 percent, 90 percent, 90 percent, 90 percent a: 10 percent, 10 percent, 10 percent, 10 percent f: find Find Student's t-critical values 1. Find the appropriate degrees of freedom for the given sample size. 2. Find the approrpriate t critical values for the given confidence level and degrees of freedom.

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n: 10, 15, 20, 25 df: find 1-a: 90 percent, 90 percent, 90 percent, 90 percent a: 10 percent, 10 percent, 10 percent, 10 percent f: find Find Student's t-critical values

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

Degrees of freedom is n-1

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

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

n 10 15 20 25
df 9 14 19 24
CI 90% 90% 90% 90%
10% 10% 10% 10%
t* 183 176 173 171
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