Verify the result on page 318, which expresses T in terms of X1, X2, and Sp.
Answer to relevant QuestionsBy solving For θ, Show that Are (1 – α) 100% confidence limits for θ. A district official intends to use the mean of a random sample of 150 sixth graders from a very large school district to estimate the mean score that all the sixth graders in the district would get if they took a certain ...In a study of television viewing habits, it is desired to estimate the average number of hours that teenagers spend watching per week. If it is reasonable to assume that σ = 3.2 hours, how large a sample is needed so that ...To study the effect of alloying on the resistance of electric wires, an engineer plans to measure the resistance of n1 = 35 standard wires and n2 = 45 alloyed wires. If it can be assumed that σ1 = 0.004 ohm and σ2 = 0.005 ...Show that among all (1 – α) 100% confidence intervals of the form The one with k = 0.5 is the shortest.
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