Stats Final Exam Notes

Stats Final Exam Notes - Sharon Ngs Statistics Final Notes...

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Sharon Ng’s Statistics Final Notes 1) For the question “How many children have you ever had?” in the 2006 General Social Survey, the results were: # children 0 1 2 3 4 5 6 7 8+ Count 1216 710 1147 738 386 139 83 43 35 a) Find the mean, median, mode, SD, Q1, and Q3. Calculator: calc option 1 Mean = 1.90; mode = 0; median = 2; s = 1.68; Q1 = 0; Q3 = 3 b) Based on the sketching or using software to construct the graph, characterize this distribution as skewed to the left, skewed to the right, or symmetric. Explain. Skewed to the right 2) The table shows a short excerpt from a “car weight and mileage” data file. That file lists several 2004 model cars with automatic transmission and their x=weight (lbs) and y=mileage (mi/gal of gas). Find the predicted mileage for a Hummer H2. Interpret. Automobile Brand Weight Mileage Honda Accord Sedan LX 3164 34 Toyota Corolla 2590 38 Dodge Dakota Club Cab 3838 22 Jeep Grand Cherokee Laredo 3970 21 Hummer H2 6400 17 Calculator: calc option 8… where’s r? r ~ -0.84 high negative correlation y = 47.32 – 0.005x x = 6400 y = 47.32 – 0.005(6400) = 15.32 3) For the normal height distribution of adult females in North American (u=65.0 in, sigma=3.5 in), find the proportion who are: a) Under 60 inches b) over 72 inches
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Stats Final Exam Notes - Sharon Ngs Statistics Final Notes...

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