An engineer found that by adding small amounts of a compound to rechargeable batteries during manufacture, she
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An engineer found that by adding small amounts of a compound to rechargeable batteries during manufacture, she could extend their lifetimes. She experimented with different amounts of the additive ( g) and measured the hours they lasted in a laptop.
(a) Calculate the least squares estimates β̂0 and β̂1. Also estimate the error variance σ2.
(b) Test H0 : β̂1 = l versus H1 : β̂1 ≠ 1 with α = .05.
(c) Estimate the expected y value corresponding to x = 3.5 and give a 95% confidence interval. Interpret.
(d) Construct a 90% confidence interval for the intercept β̂0. Interpret.
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Related Book For
Statistics Principles And Methods
ISBN: 9781119497110
8th Edition
Authors: Richard A. Johnson, Gouri K. Bhattacharyya
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