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Practice Midterm I(1)

# Practice Midterm I(1) - STAT2103 Practice Midterm I(1 hour...

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STAT2103 Practice Midterm I (1 hour 30min) Instructions: 1. Closed book/notes; 2. You can bring a letter size formula and a calculator; 3. Expect 25 multiple choice questions in Midterm; 4. Circle the best answer for a multiple choice question; 5. Write your answer for the fill in the blank question and show the work below. 1. Values of the data must represent ordered rankings for what type of variable? a. Interval variable b. Nominal variable c. Ordinal variable d. Ratio variable e. None of the above Answer: c Using the following information answer questions 2 to 6 The scores on a calculus exam for a random sample of 40 students are plotted below: Class Limits Frequency Relative Frequency 30 to 39 2 0.050 40 to 49 4 0.100 50 to 59 8 0.200 60 to 69 11 0.275 70 to 79 8 0.200 80 to 89 5 0.125 90 to 99 2 0.050 Total 40 1.00 Stem Leaf 3 68 4 1278 5 14456789 6 12234578889 7 11456799 8 12346 9 14 2. Describe the shape of the data. Answer: __Single modal symmetric_____ 3. The mean and the variance of the Exam scores: Answer: mean= __65.4____ variance ___211.1 (14.5)__ 4. The median and the IQR of the Exam scores: Answer: median: ___66__IQR: __20.5__ 5. Calculate the percentage of data which falls between the range s x - and s x + . _27/40 = 67.5%_ 6. Calculate the percentage of data which falls between the range s x 2 - and s x 2 + . Answer: _39/40 =97.5%_ Using the following information answer questions 7 to 8: The monthly percentage of cancelled flights at a major airport from 1995 to 2005 is plotted below: 1

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Using 0 20 40 60 80 100 120 0.8 2.5 4.3 6.1 7.9 9.6 11.4 13.2 14.9 16.7 18.5 More U Frequency BoxPlot 0.77 5.77 10.77 15.77 20.77 7. Describe the shape of the distribution. Answer:_Single modal right skewed _ 8. Using the plots, identify the approximate value of Q3 + 1.5 IQR? Answer: _approx. between 4 and 5_ 9. The manager of the customer service division of a major consumer electronics company is
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Practice Midterm I(1) - STAT2103 Practice Midterm I(1 hour...

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