Mathematics, 11.12.2019 00:31 dianactorres
If the standard deviation of shear strength measurements for spot welds is 10.5 pounds per square inch (psi), what is the minimum number of test welds that should be sampled if we want the sample mean to be within 0.9 psi of the true mean with probability approximately 0.99? (round your answer up to the nearest whole number.)
Answers: 3
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Abottled water distributor wants to estimate the amount of water contained in 1-gallon bottles purchased from a nationally known water bottling company. the water bottling company’s specifications state that the standard deviation of the amount of water is equal to 0.02 gallon. a random sample of 50 bottles is selected, and the sample mean amount of water per 1-gallon bottle is 0.995 gallon a. construct a 99% confidence interval estimate for the popula-tion mean amount of water included in a 1-gallon bottle. b. on the basis of these results, do you think that the distributor has a right to complain to the water bottling company? why? c. must you assume that the population amount of water per bottle is normally distributed here? explain. d. construct a 95% confidence interval estimate. how does this change your answer to (b)?
Answers: 2
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