The national highway system is made up of interstate and
The national highway system is made up of interstate and non interstate highways. The Federal Highway Administration reported the number of miles of each type in each state. Listed is a random sample of 20.
Define “ratio I/N” to be number of interstate miles divided by number of non interstate miles.
a. Inspect the data.What do you estimate the “average” ratio I/N to be?
b. Calculate the “ratio I/N” for each of the 20 states listed.
c. Draw a histogram of the “ratio I/N.”
d. Calculate the mean “ratio I/N” for the 20 states listed.
e. Use the total number of 20-state interstate and noninterstate miles to calculate the “ratio I/N” for the combined 20 states.
f. Explain why the answers to parts d and e are not the same.
g. Calculate the standard deviation for the “ratio I/N” for the 20 states listed.
h. Use the dataset indicated to answer the questions in parts b through g using all 51 values.
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