https://www.statcrunch.com/app/?dataurl=http://www.statcrunch.com/books/CQL/dataset/Fuel_Economy.txt&dlim=tab&ft=true

A federal government agency that is responsible for setting vehicle fuel economy standards for automobile manufacturers is conducting research in order to update its fuel economy standards for the year 2030. Automobile manufacturers, and consumers, are highly interested in what the agency's findings and determinations will be as this will affect every vehicle in the United States. The federal government agency is very interested in the relationship between the weight of a vehicle and the vehicle's fuel economy (average miles per gallon (MPG)). Specifically, the agency is concerned that if the current trend of automobile manufacturers producing heavier new vehicles continues that its fuel economy targets will not be met. The agency's research department recently collected data for analysis in order to support the agency's upcoming discussion with industry regarding its proposed 2030 fuel economy standards. The average MPG from a random sample of 750 vehicles was recently calculated by the agency. The research division also collected the vehicle weight of these 750 randomly sampled vehicles. The Vehicle Number, Type, Vehicle Weight, Average MPG, Fuel Tank Size (Gallons), Engine Size (Liters), and Meet or Not Meet Current Standards data were collected for these 750 vehicles.

Which of the following more closely describes the method of data collection used?

1. is this Controlled experiment or Observational study, Briefly explain

2. Examine https://www.statcrunch.com/app/?dataurl=http://www.statcrunch.com/books/CQL/dataset/Fuel_Economy.txt&dlim=tab&ft=true and then define each of the following variables as qualitative or quantitative. If the variable is qualitative, indicate if it is nominal or ordinal. If it is quantitative, indicate whether it is interval or ratio and whether it is discrete or continuous. Variable A: Vehicle typeVariable B: Vehicle weightVariable C: Average MPGVariable D: "Meets current standards" or "Does not meet current standards" classification

3. Given the attached excel spreedsheet in the link (https://www.statcrunch.com/app/?dataurl=http://www.statcrunch.com/books/CQL/dataset/Fuel_Economy.txt&dlim=tab&ft=true) , create a histogram of the "Average MPG" data, setting your bin width equal to three. From your visual analysis, describe the shape and center of the distribution. Select the correct choice below and fill in the answer box to complete your choice (type a whole number).

A. is The distribution is roughly symmetric and unimodal with the typical Average MPG around

enter your response here.

B. is The distribution is multi-modal with the typical Average MPG around

enter your response here.

C. is The distribution is bimodal with the typical Average MPG around

enter your response here.

4. Based upon your visual analysis of the "Average MPG" histogram, what is the most appropriate measure of center and variation to calculate and interpret?

a. The median and Interquartile Range

b. The median and standard deviation

c. The mean and Interquartile Range

d. The mean and standard deviation

5. What was the mean "Average MPG" for these 750 vehicles?

The mean "Average MPG" is ?

6. What was the standard deviation of the "Average MPG" for these 750 vehicles?

the standard deviation is ___MPG?

7. What was the median "Average MPG" for these 750 vehicles?

The median "Average MPG" is?

8. What was the interquartile range of the "Average MPG" for these 750 vehicles?

The interquartile range is ___mpg?

9. Based on your answers to questions #5 - #8, which is the most appropriate measure of center and variation?