Question: There is no additional information or data. Only a hint that says what is the critical value for an 80% confidence level? With 90%

There is no additional information or data. Only a hint that says " what is the critical value for an 80% confidence level?"

With 90% confidence, for sample mean 319.50, sample standard deviation 11.70, and sample size 35, what is the upper confidence limit with 2 decimal places? Your

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