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According to a report done by S&J Power, the mean lifetime of the light bulbs it manufactures is 45 months. A researcher for a consumer advocate group tests this by selecting 90 bulbs at random. For the bulbs in the sample, the mean lifetime is 44 months. It is known that the poulation standard.deviatian of the lifetimes is 7 months. Can we conclude, at the 0.05 level of sionificance, that the ponulation mean lifetime, , of light bulbs made by this manufacturer differs from 45 months? Perform a twotailed.test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list.of.farmulas.) (a) State the null.hvnothesis //, and the alternative.hvRothesis // bx

According to a report done by S&J Power, the mean lifetime of the light bulbs it manufactures is 45 months. A researcher for a consumer advocate group tests this by selecting 90 bulbs at random. For the bulbs in the sample, the mean lifetime is 44 months. It is known that the poulation standard.deviatian of the lifetimes is 7 months. Can we conclude, at the 0.05 level of sionificance, that the ponulation mean lifetime, , of light bulbs made by this manufacturer differs from 45 months? Perform a twotailed.test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list.of.farmulas.) (a) State the null.hvnothesis //, and the alternative.hvRothesis // bx

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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According to a report done by 5 &J Power, the mean lifetime of the light bulbs it manufactures is 45 months. A researcher for a consumer advocate group tests this by selecting 90 bulbs at random. For the bulbs in the sample, the mean lifetime is 44 months. It is known that the population standard deviation of the lifetimes is 7 months. Can we conclude, at the 0.05 level of sionificance, that the ponulation mean lifetime, u, of light bulbs made by this manufacturer differs from 45 months? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null.hynothesis //, and the alternative hypothesis // 合 H, :0
Transcribed Image Text:According to a report done by 5 &J Power, the mean lifetime of the light bulbs it manufactures is 45 months. A researcher for a consumer advocate group tests this by selecting 90 bulbs at random. For the bulbs in the sample, the mean lifetime is 44 months. It is known that the population standard deviation of the lifetimes is 7 months. Can we conclude, at the 0.05 level of sionificance, that the ponulation mean lifetime, u, of light bulbs made by this manufacturer differs from 45 months? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null.hynothesis //, and the alternative hypothesis // 合 H, :0
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