This question is from a practice quiz that I already took. I am trying to understand the formula needed to obtain the answer. I think I understand how to find the T Statistic 17.5-20/ 10/ 6.324555 but I am struggling with the next steps. (critical value and confidence limits)
Test the claim at α = 0.10 that μ = 20. A sample size of 40 yields a sample mean of 17.5 and a sample standard deviation of 10. What is the upper confidence limit with 3 decimal places?