# Male female democrat 300 600 republican 500 300 other

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MaleFemaleDemocrat300600Republican500300Other200100
8.Mr. Yates picked up a dozen items in the grocery store with a mean cost of \$3.25.Then headded an apple pie for \$6.50.The new mean for all 13 items is
9.A small company estimating its photocopying expenses finds that the mean number of copiesmade per day for the past 12 months is 258 copies per day with a standard deviation of 24copies per day.Which of the following is a correct interpretation of standard deviation?
10.The five-number summary for scores on a statistics exam is 11, 35, 61, 70, 79.In all, 380students took the test.About how many had scores between 35 and 61?
36The Practice of Statistics, 4/e- Chapter 1© 2011 BFW Publishers
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 137Part 2:Free ResponseShow all your work.Indicate clearly the methods you use, because you will be graded on thecorrectness of your methods as well as on the accuracy and completeness of your results andexplanations.Nitrates are organic compounds that are a substantial component of agricultural fertilizers.When those fertilizers run off into streams, the nitrates can have a toxic effect on animals thatlive in those streams.An ecologist studying nitrate pollution in two streams collects data onnitrate concentrations at 42 places on Stony Brook and 42 places on Mill Brook.His results aregiven in the dotplots and computer output below.TotalVariableCountMeanSE MeanStDevMinimumQ1MedianQ3Stony Brook425.5240.4512.9220.0003.5005.0007.500Mill Brook427.9290.7114.6070.0004.5008.25010.50011.Determine if there are any outliers in each distribution.Show your work.12.Draw parallel boxplots of these two distributions.Be sure to label the plots and provide ascale.13.Write a few sentences comparing the nitrate concentrations in Stony Brook and Mill Brook.Maximum12.00020.000
38The Practice of Statistics, 4/e- Chapter 1© 2011 BFW PublishersThe following data represent scores of 34 students on a calculus test.725973727474617278805756767288745783687970656776677214.Construct a histogram for this distribution.Choose an appropriate bin width, and be sure toprovide a label and scale for each axis.15.Based on your histogram, what numerical measures of center and spread would be best touse for this distribution?Explain your choice.6767546573717653
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 139In a study of the relationship between the amount of violence a person watches on TV and theviewer’s age, 81 regular TV watchers were randomly selected and classified according to theirage group and w

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