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Chapter 3 Presentation Math

# Chapter 3 Presentation Math - The Calculator Method We want...

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Click to edit Master subtitle style 6/21/11 Ericson Johnson Jennifer Major Kevin Anderson Cynthia Olaoluwa Chapter 3 Presentation

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6/21/11 Problem…. In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on 1152 vehicles. There are a number of outliers, mainly vehicles with very poor gas mileage. If we ignore the outliers, however, the combined city and highway gas mileage of the other 1120 or so vehicles is approximately Normal with mean 18.7 miles per gallon and standard deviation 4.3 mpg.
6/21/11 Our Problem…… Problem 3.32 The top 10%. How high must a 2008 vehicle’s gas mileage be in order to fall in the top 10% of all vehicles? ( The distribution omits a few high outliner, mainly hybrid gas eclectic vehicles).

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6/21/11 = 18.7 =4.3 l From our problem….. 10 % = 18.7 =4.3

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Unformatted text preview: ? 6/21/11 The Calculator Method We want the height from the 10%. So we use the invnorm function. To get invNorm on the calculator you press the button followed by the button and select invNorm. invNorm = ( area to the left of cutoff, mean (u) ,Standard deviation ( - )) Remember we have to change the 10% into decimal form so we divide 10/100 and get 0.10. Plug in your data 6/21/11 OR…… … 6/21/11 The Table method . Using table A. . Turn the percentage into a decimal which is 0.0 On the chart the closet to the decimal is .1000 The number found closets is .1003 Therefore, according to the chart…. Z= -1.28 We found the standardized value of x by performing the following equation x – 18.7 -1.28 -5.504 = x – 18.7 4.3 4.3-1.28 = = x – 18.7 X = 13. 19...
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