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Confidence intervals 4. Recall for this M&M's bag, T has approximately a normal distribu- EC.OL tion with unknown mean / and known standard deviation o

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Confidence intervals

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4. Recall for this M&M's bag, T has approximately a normal distribu- EC.OL tion with unknown mean / and known standard deviation o / Vn = 8.182/V32. For this exercise, assume u = 10.9375. Find the z-score of each of the following two x-values: (a) 8.102 (b) 13.773 [Hint: Use the version of Formula 17 in equation (2.1).]

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