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A newspaper reports that the governor's approval rating stands at 69%. The article adds that the poll is based on a random sample of 726 adults and has a margin of error of 4%. What level of confidence did the pollsters use?
If a simple random sample of 80 seniors is taken, what is the probability that at most 64 of them will be accepted into college.
the central limit theorem can be used to analyze round-off error. suppose that the round-off error is represented as a
She wants to choose the passing grade such that the probability of passing a student who guesses on every question is less than 1/10. What score should she set as the lowest passing grade?
Based on the information about typical use, what is the probability that at least 25 of these women become pregnant in the next year? Is the Normal approximation permissible?
When a customer places an order with Office Works, a computerised Accounting Information System (AIS) automatically checks to see if the customer has exceeded his or her credit limit. Past records indicate that the probability of customers exceeding ..
random variable Y that has an exponential distribution with mean equal to 4 tons. The cost of the flour is proportional to U=3Y+1. Find the probability density function for U.
Students at a major university are complaining of a serious housing crunch
question a researcher in the west coast of the u.s. wants to estimate the amount of a newly discovered antibody in
a contractor is considering a sale that promises a profit of 20000 with a probability of 0.7 or loss of 7000 with a
A recent report in BusinessWeek indicated that 20 percent of all employees steal from their company each year. fewer than 5 employees steal?
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
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