Question: The population deviation 0' is not known, and the sample size is 28. If we wish to estimate the population mean u with 90% condence,

The population deviation 0' is not known, and the sample size is 28. If we wish to estimate the population mean u with 90% condence, what is the appropriate critical value t to use? Round to THREE DECIMAL PLACES. Example: If the critical value :2 = 9.123 , enter 9.123 as your answer. 2

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