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Fall 2013 Final Exam SolutionsSTAT 225December 13, 2013Name:Choose your Section Time: (Circle one)7:30 Whitney10:30 Pan12:30 Allison3:30 Xiang8:30 Patrick10:30 Jeremy1:30 Mike4:30 Xiang9:30 Pan11:30 Jeremy2:30 MikeONLINEDirections1. Show your work on ALL questions. Unsupported work will NOT receive full credit.2. Decimal answers should be exact, or to exactly 4 significant digits.3. You are responsible for upholding the Honor Code of Purdue University. This includesprotecting your work from other students.4. Please write legibly. If a grader cannot read your writing, NO credit will be given.5. You are allowed the following aids:(a) a one-page 8.5“x11” handwritten cheat sheet(b) Scientific Calculator (in accordance with the syllabus)(c) Pencils or pens6. Cheat sheets with photocopied or printed information are not allowed and are subject todisciplinary actions as specified in the syllabus.7. Instructors will not interpret questions for you. If you do have questions, wait until youhave looked over the whole exam so that you can ask all your questions at one time.8. Turn off your cell phone before the exam begins.ProblemPoints PossiblePoints Earned1112153134125136 and 768 and 95107Cheat Sheet2Total841
Problem 1Fill in the blank with thecapitalletter associated with the word from the following list thatbestillustrates the given scenario.(1 point for each answer)A. VarianceB. CovarianceC. CorrelationD. IQRE. SDF.r2G. CrosstabsH. BoxplotI. HistogramJ. Pie ChartK. Bar GraphL. Line GraphM. ScatterplotN. SRSO. Stratified SamplingP. Convenience SamplingQ. Cluster SamplingR. Probability SamplingS. QualitativeT. QuantitativeU. NominalV. OrdinalW. IntervalX. RatioY. Skewed-rightZ. Symmetrica.Which graphical display is most appropriate to represent the relationship betweentime spent daydreaming and time spent on the phone in class?M. Scatterplotb.What could tell you the strength of the relationship between time spent daydream-ing and time spent on the phone in class?C. Correlationc.The number of times that Maxine wants to play fetch in a day is what type ofvariable?T. Quantitatived.Noah divided the animal kingdom into species and gender, then randomly picked 1from each combination. What sampling technique did he use?O. Stratified Samplinge.