9 the weights of the male and female students in a

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9.The weights of the male and female students in a class are summarized in the followingboxplots:Which of the following is NOT correct?(a) About 50% of the male students have weights between 150 and 185 pounds.(b) About 25% of female students have weights above 130 pounds.(c) The median weight of male students is about 162 pounds.(d) The mean weight of female students is about 120 pounds.(e) The male students have less variability than the female students.
10.When testing water for chemical impurities, results are often reported as bdl, that is, belowdetection limit.The following are the measurements of the amount of lead in a series ofwater samples taken from inner-city households (in parts per million):5, 7, 12, bdl, 10, 8, bdl, 20, 6Which of the following statements can we be sure is true?
44The Practice of Statistics, 4/e- Chapter 1© 2011 BFW PublishersPart 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.The states differ greatly in the kinds of severe weather that afflict them.The histogram belowshows the distribution of average annual property damage caused by tornadoes over the period from1950 to 1999 in the 50 United States. (To adjust for the changing buying power of the dollar overtime, all damages were restated in 1999 dollars.)11.Describe the important features of this distribution.What does this tell you about how theeconomic burden of tornados is distributed among the states?12.When asked for summary statistics, MINITAB produced the following output:VariableNMeanSE MeanStDevMinimumQ1MedianQ3Damage50 22.393.6025.450.002.2312.6641.63Give the five-number summary, and explain why you can see from these five numbers that thedistribution is strongly skewed to the right.13.The histogram suggests that there may be outliers.Use the 1.5 x IQR rule of thumb to show thatno values in this distribution meet this criterion for outliers.90807060504030201002520151050Average annual tornado damage, $millionsNumber of statesMaximum88.60
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 145Below are the lengths, in minutes, of the 25 most popular movies, as voted on by visitors to aweb site devoted to movies.1421952011391759612113020013310217816112414611515415220711214.Make astemplot of these data.15.The mean of this distribution is 144.7 and the median is 139.Explain why you could havepredicted that the mean would be higher than the median by looking at the stemplot.106109165118136

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