Speed/ Stopping Distance

20 64

20 62

20 59

30 114

30 118

30 105

40 153

40 171

40 165

50 231

50 203

50 238

60 317

60 321

60 276

1. Please use JMP or Excel to create a scatter plot for this data using the stopping distance as the vertical axis and the speed as the horizontal axis. Remember to use a title, and name the axes.
2. Does this data have a linear trend? Please explain using the coefficient of correlation.
3. Please identify any outliers and influential points in the plot.
4. Identify the response variable and the explanatory variable.
5. Please find the least square regression line (line of best fit) for the data.
6. What are your thoughts? Was it appropriate to run a linear regression on the data set? Please explain.
7. Using your prediction models, find the stopping distance of a car traveling at 82 mph.