The U.S. Department of Energy\'s Fuel Economy Guide provides fuel efficiency dat

Question

The U.S. Department of Energy's Fuel Economy Guide provides fuel efficiency data for cars and trucks. (See exercise 35 on page 77 in your textbook for a similar problem.) Use the data in the Fuel Data sheet in this workbook to generate excel output to answer the following questions. Please note that units are "liters" for engine size and "miles per gallon" for highway fuel efficiency. Put the output in given space on Fuel Data sheet. Each orange numerical answer cell below MUST reference generated Excel output cells in the Fuel Data sheet. What is range for engine size? What is the variance for highway fuel efficiency? What is IQR for engine size? What is the shape of the highway fuel efficiency distribution? Why?

Explanation / Answer

Since dataset is not give here. Following is the approaches to answer the questions:

1. Range = maximum- minimum

2. Variance = sum(xi-mean)^2/(n-1); where n is sample size. In excel pl use the formula: "=VAR.S(data)"

3. IQR is interquartile range = 3rd quartile - 1st quartile

4. Plot the relative frequency (PMF) curve and interpret the skewness

5. Need to confidence interval

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