# The percentage of hotel rates over 110 euros is

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22.The percentage of hotel rates over 110 euros is approximatelyA) 2.5%**B) 50%C) 95%D) 99.7%E) 32%
23. Corinthia Hotel London has a nightly rate of 90 euros.The corresponding z-score forthis hotel is about
24. Which of the following will decrease the width of a confidence interval (assuming thateverything else remains constant)?
25. A 95% confidence interval estimate can be interpreted to mean that
95% of them would include the true population mean somewhere within their interval.B) we have 95% confidence that we have selected a sample whose interval does includethe population mean.C) Both of the above.**D) None of the above.
26. In an application to estimate the mean number of miles that downtown employeescommute to work roundtrip each day, the following information is given:n = 20= 4.33s= 3.50Based on this information, the upper limit for a 95 percent confidence interval estimatefor the true population mean is:A) about 5.97 miles.**B) about 7.83 miles.C) nearly 12.0 miles.D) about 5.86 miles.
27. In developing a confidence interval estimate for the population mean, the t-distribution isused to obtain the critical value when:
28. An economist is interested in studying the incomes of consumers in a particular region.The population standard deviation is known to be \$1,000. A random sample of 50individuals resulted in an average income of \$15,000. What total sample size would theeconomist need to use for a 95% confidence interval if the width of the interval shouldnot be more than \$100?

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Term
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