Unformatted text preview: ables besides just the estimated cost. 4 J Diaco Elements of Statistics I Supplemental Final Exam Review One of those variables is the contractor’s estimate of the number of workdays required to finish the job. Twenty contractors have bid on the next job. The boxplot below represents their estimates of the number of work days required: 18 A) B) C) D) What is (approximately) the interquartile range, based on the boxplot?
140 days 270 days 360 days 760 days 19 A) B) C) D) Determine whether each of the following statements is true or false.
The median number of days is approximately 180. The minimum number of days is approximately 40. The maximum number of days is approximately 750. Twenty‐five percent of contractors estimated the number of days to be more than 100. 20 Agricultural fairs often hold competitions for produce grown by local gardeners. The following data are the weight (in pounds) of tomatoes entered into an annual fair in Roland, Manitoba, Canada in 2007: 2.48 1.52 1.15 1.13 1.00 0.99 0.96 0.94 0.75 The Interquartile Range (IQR) for these data is: A) B) C) D) E) 1.73 pounds 0.58 pounds 0.19 pounds 1.00 pounds 0.385 pounds 21 A) B) C) D) E) Apply the 1.5 × IQR rule to the data in question #20 to check for outlier values. In this case
there are no outliers. the value 0.75 is the only outlier. the values 0.75 and 2.48 are both outliers.
the value 2.48 is the only outlier. the values 1.52 and 2.48 are both outliers. 5 J Diaco Elements of Statistics I Supplemental Final Exam Review 22 The New England Patriots are a top ranked team in the National Football League (NFL) and the Saskatchewan Roughriders are the 2007 champions of the Canadian Football League (CFL). From the 2007 rosters of these two teams the weight of the players was determined and the following side‐by‐side boxplots of their weights is provided below: Which of the following statements about these side‐by‐side boxplots is (are) TRUE? A) B) C) D) E) The weights of the New England team exhibit less overall variation than the Saskatchewan team.
The median weight for the New England team is higher than the median weight for Saskatchewan.
The IQR for the Saskatchewan team is greater than the IQR of the New England team. A and B B and C 23 Which of the following statements about the Mean and the Median of a density curve are FALSE? A) B) C) D) E) The Median is the point on the axis that divides the area under the density curve in two equal halves.
The Median and the Mean have the same value if the density curve is symmetric. The Mean is the “balance point” of the density curve.
The Median of a skewed density curve is pulled away from the Mean in the direction of the long tail.
For a symmetric density curve both the Mean and the Median are at the center of the curve. Use the following information to answer questions 24‐25. Many residents of suburban neighborhoods own more than one car but consider one of their cars to be the main family vehicle. The age of these family vehicles can be modeled by a Normal distribution with mean 2 years and standard deviation 6 months. 24 What percentage of family vehicles is between 1 and 3 years old? A) Cannot be determined based on the information given.
B) 68% C) 95% D) 99.7% 6 J Diaco Elements of Statistics I Supplemental Final Exam Review 25 A) B) C) D) 26 W...
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This document was uploaded on 02/14/2014 for the course STATS 2035 at UWO.
- Summer '09