5. For the above data set

a.    Which variable is the independent variable? Construct a scatterplot of the above data.

 

b.   State the hypothesis.

 

c.    Calculate the correlation coefficient and test it at

 

d.    If appropriate, calculate the regression line and graph the line on the scatterplot

 

6.    This data was collected in 1986 when the U.S. had a speed limit of 55 mph because it was felt that lower speed limits reduce the highway death rate. The maximum speed limit has been raised to 70 mph or even 75 mph in some states. The reasoning was that lower speed limits did not significantly reduce the highway death rate. Based on the regression analysisdo you agree with this statement? Explain your answer. Support it with data.

 

7.

 

a.    Which is the independent variable? Construct a scatterplot for the data.

b.    State the hypothesis.

c.    Calculate and test the correlation coefficient for

d.    If appropriate, write the line of regression and graph the line on the scatterplot.

e.    Explain specifically what the slope means in the context of this problem.

f.     Predict the time it will take for a flight from Boston to Seattle (3000 miles).

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