DSCI
Exam 1 FALL 08 VERSION A solutions

# Which of the following statements is false a a

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22. Which of the following statements is FALSE ? A. A statistic is a characteristic of a sample. B. A pie chart should be used to summarize ratio data with a small number of categories. C. It is possible to retrieve original data from a histogram.* D. It is possible to retrieve original data from a stem & leaf diagram. 23.. Using the data below, the Laspeyres Index for the year 2007 using the year 2005 as a base is: Year 2005 Year 2007 Quantity Price \$US/unit Quantity Price \$US/Unit Meat 60 \$2.50 50 \$3.00 Eggs 40 \$2.00 50 \$2.50 Grains 30 \$1.00 50 \$1.50

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24. You have collected quarterly data on Ice Cream sales in Brazil. When you run the appropriate time series model (TR)(S)(C) = 884 for the Q4 of 2007. The value of the original data point, for Q4 of 2007 = 927. The value of (I) for this Quarter is: 25. You are using a Time Series Model: (TR)(S)(C)(I) and have Quarterly data and your normalized seasonality components for the Quarters 1, 2, and 3 are 1.044 1.062, 0.843. What is the value of the seasonality component for Quarter 4 and does it have a positive or negative effect seasonally? 26. You have collected two samples: Sample A and Sample B, each with an n=100. Sample A has a Mean of 40 and a Std. Dev. of 22 . Sample B has a Mean of 12 and a Std. Dev. of 8. Comparing these two samples which has the greatest variability. Use CV. A. Sample A B. Sample B*
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