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1 a random sample of 90 observations produced a mean 259 and a standard deviation 27 find an approximate 95 confidence
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a market researcher believes that brand perception of one of the companys products may vary between different groups
1 an experiment was performed on a certain metal to determine if the strength is a function of heating time results
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problem 1 the 68-95-997 rule tells us that for data that follows a normal distribution the probability that a
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