The mileage ratings of vehicles

Reference no: EM13509134

Question1
With the fluctuation of gas prices today, the mileage ratings of vehicles is of importance to most drivers. However, the ratings advertised by car manufacturers may not bear any relationship to what you get, depending on where, when, and how you drive. Nevertheless, the Environmental Protection Agency (EPA) spends countless hours collecting and analyzing data to determine estimated mileage ratings. The EPA places vehicles on a device called a dynamometer - sort of like a great big "treadmill" for cars -- where every car is put through the same routine of accelerating, braking, coasting, stopping, and switching the engine on and off. The mileage obtained during that standard cycle is then adjusted by a numerical factor to get it closer to "real world" experience. Starting with the 2008 model year, the EPA revised those tweaks to bring hybrid mileage ratings closer to actual usage. The 2009 Toyota Prius Hybrid car is advertised as having an overall mileage rating of 48 miles per gallon (mpg) for city driving, and 45 mpg for highway driving. In fact, it turns out that the actual 2009 Prius overall mileage ratings are approximately Normally Distributed with a mean of 47 mpg and a standard deviation of 2.1 mpg. QUESTION TO ANSWER: If you were to randomly select a 2009 Prius, what is the probability that it gets at least 50 mpg? (Round your answer to 4 decimal places. Do NOT include units. Do NOT include any letters, spaces, commas, or any characters other than numbers.)
Answer:

Question2

Forty 2009 Prius vehicles were randomly sampled and their mileage ratings were recorded. The data are displayed in the table below.
43 43 44 44 44 45 45 45 45 45
45 46 46 46 46 46 46 46 46 46
47 47 47 47 47 47 47 47 48 48
48 48 48 49 49 49 49 50 50 51
What is the mean of the data set? (Round your answer to one decimal place. Do NOT include units. Do NOT include units. Do NOT include any letters, spaces, commas, or any characters other than numbers.)
Answer:

Question3

What is the standard deviation of the data set? (Round your answer to one decimal place. Do NOT include units. Do NOT include any letters, spaces, commas, or any characters other than numbers.)
Answer:

Question4

Compare the sample mean from problem 2 with the population mean. Which statement below best describes your comparison?
Choose one answer.
a. The sample mean is much larger than the population mean.
b. The sample mean is much smaller than the population mean.
c. The sample mean is similar to the population mean
Question5

Compare the sample standard deviation from problem 2 with the population standard deviation. Which statement below best describes your comparison?
Choose one answer.
a. The sample standard deviation is much larger than the population standard deviation.
b. The sample standard deviation is much smaller than the population standard deviation.
c. The sample standard deviation is similar to the population standard deviation
Question6

You do NOT need to graph the data, however, if you were to graph it, what general shape would you expect to see?
Choose one answer.
A. Skewed Left
B. Skewed Right
C. Mound-shaped and symmetric
Question7

From the given sample data, actually count up the number of observations that are greater than or equal to 50 mpg. Based on that number, what proportion of vehicles in the sample got at least 50 mpg? (Round your answer to 3 decimal places. Do NOT include units. Do NOT include any letters, spaces, commas, or any characters other than numbers.)
Answer:

Question8
Marks: 1
Does your answer from problem 7 roughly match your answer to problem 1?
Choose one answer.
a. Yes, they are roughly similar.
b. No, they are extremely different.

Reference no: EM13509134

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