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A firm sells detergent packed in two plants. From past experience, the firm knows that the amount of detergent in the boxes packed in the two plants is normally distributed.
The firm takes a random sample of 25 boxes from the output of each plant and finds that the mean weight and standard deviation of the detergent in the boxes from plant 1 is 1064 g (2.34 lb) and 100 g, respectively. For the sample in plant 2, the mean is 1024 g and the standard deviation is 60 g.
- Can the firm claim with a 95% level of confidence that the boxes of detergent from plant 1 contain more than 1000 g?
- Test at the 95% level of confidence that the amount of detergent in the boxes of both plants is the same.
Fast Service, a chain of automotive tune-up shops, advertises that its personnel can change the oil, replace the oil filter, and lubricate any standard automobile in 15 minutes, on the average.
Name the inferential statistical test that would be used for the method of training and why?
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a multiple choice test consists of 60 questions. each question has 4 possible answers of which one is correct. if all
The so-called "Gambler's Fallacy" makes the mistake of not recognizing:
Use PHStat to make a box-whisker plot. If PHSTAT has yet to be installed, calculate Xmin, Xmax, Q 1 , Q 3 and median using equation in Class Notes-Quartiles, Percentile & Dectiles.
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Explain how the marketing analyst can use independent samples to collect the data.
A fabric manufacturer wants to know how large an advantage in strength fabrics treated by the Permafresh method have over the fabrics treated by the Hylite process. Give a 90% confidence interval for the difference in mean breaking strengths.
On January 11, 2005, the Gallup Organization released the results of a poll investigating how many Americans have private health insurance.
What factors should the assistant chief consider in determining the presence of gender bias in firefighter promotion? Is the promotional status of recently promoted firefighters independent of their gender
Provide an understanding and background discussion on the methodology of forecasting.
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