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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 population standard deviatian of the lifetimes is 7 months. Can we conclude, at the 0.05 level of significance, that the pooulation.mean ifetime, u, of light bulbs made by this manufacturer differs from 45 months? Perform a tao-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 nullhynothesis , and the alternative hvrothesis 1 H :0

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 population standard deviatian of the lifetimes is 7 months. Can we conclude, at the 0.05 level of significance, that the pooulation.mean ifetime, u, of light bulbs made by this manufacturer differs from 45 months? Perform a tao-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 nullhynothesis , and the alternative hvrothesis 1 H :0

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.1: Measures Of Center
Problem 4GP
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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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