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Suppose that 30% of all students who have to buy a text for a particular course want a new copy (the successes!), whereas the other 70% want a used copy. Consider randomly selecting 25purchasers.A) What are the mean value and standard deviation of the number who want a new copy of the book?b) what is the probability that the number who want new copies is more than two standard deviations away from the mean value?c) The bookstore has 15 new...
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Human Resource Consulting (HRC) is surveying a sample of 66 firms in order to study health care costs for a client. One of the items being tracked is the annualdeductible that employees must pay. The state Bureau of Labor reports the mean of this distribution is $498 with a standard deviation of $85.(a) Compute the standard error of the sample mean for HRC. (Round your answer to 2 decimal places.)Standard error(b) What is the chance HRC finds a sample mean...
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Suppose 10 gonorrhea cases are reported over a 3-month period among 10,000 people living in an urban county. The statewide incidence of gonorrhea is 50 per 100,000over a 3-month period. Is the number of gonorrhea cases in this county unusual for this time period

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For Business versus Engineering majors conduct a two sample test of the hypothesis at the 10% significance level (assume the variances are not equal):· The average ’30-Year ROI’ for Business majors is less than for Engineering Majors. Be sure to interpret your results.
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Two cards are selected from a standard deck of 52 playing cards. The first card is not replaced before the second card is selected. Find the probability of selecting a four and then selecting a king
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You wish to test the following claim (HaHa) at a significance level of α=0.001α=0.001. Ho:μ=62.7Ho:μ=62.7 Ha:μ<62.7Ha:μ<62.7You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n=19n=19 with mean M=56M=56 and a standard deviation of SD=16.2SD=16.2.What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.)p-value =
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You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 73.While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 91.3%.(Report answer accurate to three decimal places with appropriate rounding.)