Open the file Cars and Trucks.
a. Make a scatter graph of the data with a trendline, equation, and R2 value. Copy and paste your graph here.
b. Is the data linear? Explain why or why not?
c. Use the equation of the trendline to predict how many cars there will be in the US in the year 2013. How confident are you in this prediction? Why?
d. Use the equation of the trendline to predict the number of cars in US in 2050. How confident are you in this prediction? Why?
e. Use the equation of the trendline to predict when there were no cars in the US. How confident are you in this prediction? Why?
|
Years
|
Number (millions)
|
|
|
|
1970
|
103.45
|
|
1975
|
127.12
|
|
1980
|
149.48
|
|
1985
|
165.10
|
|
1990
|
181.98
|
|
1991
|
181.33
|
|
1992
|
183.67
|
|
1993
|
187.32
|
|
1994
|
190.79
|
|
1995
|
194.13
|
|
1996
|
198.86
|
|
1997
|
199.97
|
|
1998
|
203.17
|
|
1999
|
207.79
|
|
2000
|
212.71
|
|
2001
|
221.82
|
|
2002
|
220.93
|
|
2003
|
222.86
|
|
2004
|
228.28
|
|
2005
|
231.90
|