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Suppose that the length of life in hours (say, X) of the light bulb manufactured by company A is N(800,14400) and the length of life in hours (say, Y) of a light bulb manufactured by company B is N(850,2500). one bulb is randomly selected from each company and is burned unitl "death"
(a) Find the probability that the length of life of the bulb from company A exceeds the length of life of the bulb from company B by at least 15 hours.
(b) Find the probability that at least on eof the bulbs "lives" for at least 920 hours.
the produce manager for a large retail food chain is interested in estimating the percentage of potatoes that arrive on
If the daily stock price, x, of United Technology is normally distributed with mean 6.56 and standard deviation 2.4, calculate the probability that in a randomly selected ay the price will be between $3.25 and $7.36. Hint: Review normal distribution
What is the estimated index of satisfaction for a person who first married at 18, has an annual income of $26,500, has three children living, has assets of $156,000.
according to harpers index 48 of all federal inmates are serving time for drug dealing. a random sample of 15 federal
question in the poker game a hand is a set of 5 cards chosen randomly from a usual deck of 52 cards.a how many
The width of the interval without the finite population correction factor is wider than the confidence interval with the finite population correction factor.
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
Using these data, construct a 99% confidence interval to estimate the average number of days and excavator is rented to a client, and assume the number of days per rental is normally distributed in the population.
Is it reasonable to conclude that this set of n = 16 people is not a representative random sample of registered voters?
Vote in favor of ABC in the elections. Derive a 95 % confi dence interval for the mean proportion of voters in Sile who will vote for ABC in the coming elections.
Why should you use ANOVA instead of several t tests to evaluate mean differences when an experiment consists of three or more treatment conditions?
the president of a company that manufactures air conditioners is considering switching his supplier of condensers.
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