The student will calculate and construct the line of best fit between two variables.

The student will evaluate the relationship between two variables to determine if that relationship is significant.

Collect the data

Use the most recent April issue of Consumer Reports. It will give the total fuel efficiency (in miles per gallon) and weight (in pounds) of new model cars with automatic transmissions. We will use this data to determine the relationship, if any, between the fuel efficiency of a car and its weight.

Using your random number generator, randomly select 20 cars from the list and record their
weights and fuel efficiency into
[link] .

Weight

Fuel Efficiency

Which variable should be the dependent variable and which should be the independent
variable? Why?

By hand, do a scatterplot of “weight” vs. “fuel efficiency”. Plot the points on graph paper.
Label both axes with words. Scale both axes accurately.

Analyze the data

Enter your data into your calculator or computer. Write the linear equation, rounding to 4 decimal places.

Calculate the following:

a = ______

b = ______

correlation = ______

n = ______

equation:
ŷ = ______

Obtain the graph of the regression line on your calculator. Sketch the regression line on the
same axes as your scatter plot.

Discussion questions

Is the correlation significant? Explain how you determined this in complete sentences.

Is the relationship a positive one or a negative one? Explain how you can tell and what
this means in terms of weight and fuel efficiency.

In one or two complete sentences, what is the practical interpretation of the slope of the least
squares line in terms of fuel efficiency and weight?

For a car that weighs 4,000 pounds, predict its fuel efficiency. Include units.

Can we predict the fuel efficiency of a car that weighs 10,000 pounds using the least
squares line? Explain why or why not.

Answer each question in complete sentences.

Does the line seem to fit the data? Why or why not?

What does the correlation imply about the relationship between fuel efficiency and
weight of a car? Is this what you expected?

Are there any outliers? If so, which point is an outlier?

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?

fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.

Tarell

what is the actual application of fullerenes nowadays?

Damian

That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.

Tarell

what is the Synthesis, properties,and applications of carbon nano chemistry

Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.

Harper

Do you know which machine is used to that process?