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In a recent year, the Better Business Bureau settled 75% of complaints they received. (Source: USA...

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Basic Math

In a recent year, the Better Business Bureau settled 75% ofcomplaints they received. (Source: USA Today, March 2, 2009) Youhave been hired by the Bureau to investigate complaints this yearinvolving computer stores. You plan to select a random sample ofcomplaints to estimate the proportion of complaints the Bureau isable to settle. Assume the population proportion of complaintssettled for the computer stores is the 0.75, as mentioned above.Suppose your sample size is 276. What is the probability that thesample proportion will be at least 2 percent more than thepopulation proportion?

Based on historical data, your manager believes that 27% of thecompany's orders come from first-time customers. A random sample of191 orders will be used to estimate the proportion offirst-time-customers. What is the probability that the sampleproportion is between 0.31 and 0.48?

According to a 2009 Reader's Digest article, people throw awayabout 9% of what they buy at the grocery store. Assume this is thetrue proportion and you plan to randomly survey 67 grocery shoppersto investigate their behavior. What is the probability that thesample proportion does not exceed 0.14?

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Question 1 In a recent year the Better Business Bureau settled 75 of complaints they received Source USA Today March 2 2009 You    See Answer
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