(Answered) This question is from a practice quiz that i already took i

Statistics

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?

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