Question 987060: What is the approximate rate of change of the linear function?
Year 1950 1960 1970 1980 1990 2000
Pop. of country A 8.5 10.7 13.1 14.9 14.5 22.6
Pop. of country B 7.5 9.1 10.9 12.5 14.2 15.6
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! With "approximate" I will not use linear regression.
For each, look at the difference between adjacent ones and the overall difference.
A has 2.2, 2.4,1.8,-0.4,8.1
Overall A is 14.1/5=2.82 per decade, millions, thousands whatever.
B:1.6,1.8,1.6,1.7,1.4
Overall, it is 8.1/5=1.62 per decade.
These are approximates, but B has much less variability than A.
Usually with approximations,the last minus the first divided by the number is one of the best ways to get an idea of the slope.
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