Question: With 90% confidence, for sample mean 321.50, sample standard deviation 11.60, and sample size 35, what is the upper confidence limit with 2 decimal places?

With 90% confidence, for sample mean 321.50, sample standard deviation 11.60, and sample size 35, what is the upper confidence limit with 2 decimal places?

(HINT: What is the critical value for an 80% confidence level?)

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