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Compaq Computer Corporation has an assembly plant in Houston, where the company's Deskpro computer is built. Engineers at the plant are considering a new production facility and are interested in going online with the new facility if and only if they can be fairly sure that the variance of the number of computers assembled per day using the new facility is lower than the production variance of the old system.
A random sample of 40 production days using the old production method gives a sample variance of 1,288; and a random sample of 15 production days using the proposed new method gives a sample variance of 1,112. Conduct the appropriate test at α = 0.05.
What percentage of the high temperatures are within the interval x‾ - S to x‾ + S? How do these percentages compare to the corresponding percentages for a normal distribution (68.26% and 95.44%, respectively)?
Find a 95% confidence interval for the mean price of all summer sleeping bags.
a. Assume that Bangor Co. (a U.S. firm) knows that it will have cash inflows of $900,000 from domestic operations, cash inflows of 200,000 Swiss francs due to exports to Swiss operations, and cash outflows of 500,000 Swiss francs at the end ..
a local authority installs 2000 electric lamps. the life of lamps in hours x follows a normal distribution where
State the decision rule? (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.)
Using continuity Correction. There are many situations in which a normal distribution can be used as a good approximation to a random variable that has only discrete values. In such cases, we can use this continuity correction.
Develop forecasts for the years 6 through 13 using a 5-year moving average and Weight the most recent year by 6, the previous year by 4, the year before that by 2, and the other years by 1.
On the faculty of a university there are three professors named Smith
a standard 52-card deck is shuffled and 2 cards are picked without replacement from the top of the deck. the
The weight of an almond is normally distributed with mean 0.05 ounce and standard deviation of 0.015 ounce. Find the probability that a package of 100 almonds will weigh between 4.3 and 5.3 ounces.
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
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