Since we have a very small sample size (n=6) we should use the t-distribution, with df = n-1 = 5. So the critical t-stat for an 80% confidence interval is given by the cdf of the t distribution at 0.9 (1-alpha/2):
t.inv(0.9, 5) = 1.476 to 3 decimal places.
Content will be erased after question is completed.
Enter the email address associated with your account, and we will email you a link to reset your password.
Forgot your password?