Question

If a sample has 20 observations and a 90% confidence estimate for is needed, the appropriate t-score is:

Answer 1

Appropriate t-score that is need for confidence estimate : t/2 for n-1 degrees of freedom

Number of observations : Sample size : n= 20

Degrees of freedom = n-1 =20-1=19

Confidence level = 90%

for 90% confidence = (100-90)/100 =0.10

/2 =0.05

the appropriate t-score is t/2 = t0.05 for 19 degrees of freedom = 1.729

If a sample has 20 observations and a 90% confidence estimate for is needed, the appropriate t-score is : 1.729