(a) Show how we calculated the endpoints, 0.6880 and 2.1178, of our confidence interval for σ. (b) At the beginning of this section we said “… the sampling distribution of the estimator-the distribution of s2-is NOT normal.” Explain. (c) If it's true that “the effect of the contaminant is easily controlled, provided the amount of contaminant is accurately predictable,” which supplier would you prefer: the one with or the one with (d) Verify that is a linear function of s2(e) How did we find Land U from the X2 table?
(a) Show how we calculated the endpoints, 0.6880 and 2.1178, of our confidence interval for σ ….
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