The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLS is equal to 7550 hours. The population standard deviation is 1,120 hours. A random sample of 64 light bulbs indicates a sample mean life of 7,214 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7550 hours? b. Compute the p-value and interpret its meaning. c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs.

Q: a manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. a homeowner…

A: Given n=40 Standard deviation =80 Xbar=1030 Level of significance=0.05 Mu0=1050

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A: given dataraw score  x = 45standard score   z = 1.6mean μ = 39S.D.  σ = ?

Q: At the 0.05 level of​ significance, is there evidence that the mean life is different from 7,543…

A: Solution: Given: Sample mean is = x= 7243 and the known population standard deviation is σ = 1080…

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A: Mean(μ)=120 Standard deviation(σ)=10 Raw score(X)=115

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A: The provided data is,

Q: A bottler of drinking water fills plastic bottles with a mean volume of 998 milliliters (mL) and a…

A: Given:  µ = 998 mL  σ = 7 mL

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A:

Q: he average number of minutes per week that teenagers spend texting is 240.0 . Assume the standard…

A: Given data, μ=240σ=72If n=64P(230<X<250)=?

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Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A:

Q: A radio station claims that the amount of advertising each hour has a mean of 17 minutes and a…

A:

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A: Hi! Thank you for the question As per the honor code, We’ll answer the first question since the…

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A: The detailed solution is as follows below:

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A: Given Information: A population of scores has a mean of 56. μ=56 Raw score X = 40 corresponds to a z…