Question: Compute a 95% confidence interval for the population mean, based on the sample 21, 28, 33, 34, 25, 26, and 135. What is the critical

Compute a 95% confidence interval for the population mean, based on the sample 21, 28, 33, 34, 25, 26, and 135. What is the critical value, (4 decimal digits)

What formula do I use to find the critical value?

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