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An office building in New York uses thousands of fluorescent light bulb each year. The brand of bulb it currently uses has a mean life of 900 hours. A manufacturer claims that its new brand of bulbs, which cost the same as the brand the office building currently uses, has a mean life of more than 900 hours. The university has decided to purchase the new brand if, when tested, the test evidence supports the manufacturer's claim at the .05 significance level. Suppose 64 bulbs and the sample has a mean of 920 hours and a standard deviation of 80 hours.
What are the null hypothesis and the alternative hypothesis?
Should the office building purchase the new brand of florescent bulbs? (i.e. test your hypothesis using a z-test)
mvp mobileyou work for mvp mobile as a marketing analyst. mvp mobile sells the glx i smartphone with either the silver
As part of a long-term study of individuals 65 years of age or older, sociologists and physicians at the Wentworth Medical Center in upstate New York conducted a study to investigate the relationship between geographic location and depression.
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
the distribution of the amount of money in savings accounts for florida residents has an average of 2200 dollars and a
a new muscle relaxant is available. researchers from the firm developing the relaxant have done studies that indicate
Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Are there outliers in the distribution of BMI (justify your answer)?
Determine 80% confidence interval for average weights of Allen's hummingbirds in study regions. Determine the margin of error?
Suppose that sales of lemonade and sales of brownies are independent, determine standard deviation in his revenue.
1. consider a continuous random variable x with varx 4. a sample of 50 measurements of x is taken and xbar 68a.
Describe the Linear programming problem with constraints. Which among the following is not acceptable as a constraint in a linear programming problem?
question a researcher conducted and experiment on the effects of a new drug on depression. the researcher had a
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
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