c. Step 2: Find critical value. Using StatCrunch or Table A-3 in your reference packet, find t_{a/2}, the critical t value associated with a 95% confidence interval. On the image below, identify all known areas, shade the critical regions, and label the critical value. t_{a/2} = ______ d. State the formula used to find the margin of error for your confidence interval. E = e. Step 3: Calculate margin of error. Using the formula stated in part d., find your margin of error. f. Step 4: Construct confidence interval. Now that you have your sample mean and margin of error, find the confidence interval estimate for ?. State your final answer in the spaces provided. ______ mins. < ? < ______ mins.
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The critical t value depends on the degrees of freedom, which is typically the sample size minus 1. For example, if you have a sample size of 30, the degrees of freedom would be 29. Looking up this value in a t-distribution table for a two-tailed test at the 95% Show more…
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