Mathematics, 03.12.2021 21:40 21raytyrm
g A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1305 hours and a standard deviation of 92 hours. Analysis of bulbs of model B showed a mean lifetime of hours and a standard deviation of hours. Assume that the populations of lifetimes for each model are normally distributed and that the variances of these populations are equal. Construct a confidence interval for the difference between the mean lifetime of model A bulbs and the mean lifetime of model B bulbs. Then find the lower limit and upper limit of the 95% confidence interval.
Answers: 2
Mathematics, 21.06.2019 16:30
Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done
Answers: 3
Mathematics, 21.06.2019 18:30
Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?
Answers: 3
g A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A a...
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