Albarellak
2021-01-31
The table gives the midyear population of Japan, in thousands, from 1960 to 2010.
Use a calculator to fit both an exponential function and a logistic function to these data. Graph the data points and both functions, and comment on the accuracy of the models. [Hint: Subtract 94,000 from each of the population figures. Then, after obtaining a model from your calculator, add 94,000 to get your final model. It might be helpful to choose
cheekabooy
Skilled2021-02-01Added 83 answers
Step 1
Following the suggestions given by the problem, let
enter the population numbers with 94000 subtracted from each.
Using Desmos, first add a table. (clic on "
Step 2
Step 3
Next, you can get an exponential form
The values for a and b appear below. It should look similar to what is the lower right in the image above. Desmos gives a different answer than the book's. (Compare it in the graph at the bottom). The model with the proper variable names and shifted back up by 94000 would be:
Step 4
Next in another box below, type this to get a logistic model:
Step 5
This time it does given an answer similar to the book's. Using the right variables and shifting back up by 94000, we have:
Step 6
Using GeoGebra 5 and entering the same numbers in as a list of points, the command FitExp does give the same answer as the book. (shifted it back up by 94000 here)
Step 7
The logistic model is better than the exponential. The Desmos one seems to stay closer to the points overall than the other exponential one.
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