The significance level, often denoted as α (alpha), is the probability of rejecting the null hypothesis when it is true. It is typically set before conducting the hypothesis test.
In this case, we are not conducting a hypothesis test, but rather calculating a confidence interval. The confidence level is 90%, which is equivalent to a significance level of α = 1 - confidence level = 0.1 (or 10%).
Assuming CLT applies for the sample data given by 54, 56, 59, 59, 65, 66, 67, 68, 69, 76, 84, 86, 89, 94, 101 Find a 90% CI to three decimals for the mean
What is the significance level, a?
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