For the above data, calculate the sampling distribution parameters
Since sigma's unknown, you use a t-distribution with n - 1 = 35 degrees of freedom. The sampling mean is still 120, and the standard error of the mean is s/sqrt(n) = 18/sqrt(36) = 3.
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Since sigma's unknown, you use a t-distribution with n - 1 = 35 degrees of freedom. The sampling mean is still 120, and the standard error of the mean is s/sqrt(n) = 18/sqrt(36) = 3.