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Several random samples, each of which has 10 brains, are selected from this population. The means of these samples are calculated.
(i) What distribution the means of 10 brains follows? Calculate the parameters to describe this distribution (i.e., mean and standard deviation of the means).
(ii) What is the probability that this sample mean is between 14.0 g and 15.0 g?
A worker faces a review every year. He prefers to spend time making if he will be reviewed; otherwise he would prefer to use time somewhere else.
A public relations intern realizes that she forgot to assemble the consumer panel her boss asked her to do. She panics and decides to randomly ask (independent) people if they will work on the panel for an hour.
Suppose that the MBA education industry is constant cost and is in long run equilibrium. Demand raise, but due to strict accreditation standards, new companies are not allowed to enter the market.
Three students, Jim, Joan, and Jethroe are registered for the same class and attend independently to each other, Jim 95.7% of the time, Joan 92.3% of the time, and Jethroe 82.8% of the time. What is the probability that on any given day:
A hat contains three coins - one gold, one silver and one copper. You will select coins one at a time without replacement until you choose the gold coin. The outcome of interest is the sequence of coins that are selected during this process.
A dentist sees about fifteen new patients per month (the rest of her patients are repeats). She knows that on average, over the past year, about half of her patients have needed at least one filling on their first visit.
Ashland MultiComm Services (AMS) is a residential telecommunications provider. The AMS technical services department has embarked on a quality improvement program. Its first project relates to maintaining the target upload speed for its Internet s..
Assume you are one of two manufactures of tennis balls. Both you and your competitor have zero marginal costs. Total demand for tennis balls is
If a citizen who voted in the last election is randomly selected, what is the probability that they are a Democrat?
In a study to estimate the portion of residents in a certain city and its suburbs who favor the construction of a nuclear power plant, it is found that 63 of 100 urban residents favor the construction while only 59 of 125 suburban residents are in..
National polls are often conducted by asking the opinions of a few thousand adults nationwide and using them to infer the opinions of all adults in the nation. Explain who is in the sample and who is in the population for such polls. Please use a ..
A sample set of 29 scores has a mean of 76 and a standard deviation of 7. Can we accept the hypothesis that the sample is a random sample from a population with a mean greater than 72? Use alpha = 0.01(1-tail) in making your decision.
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