
Concept explainers
To graph: The data of the table.

Answer to Problem 33E
P=7.5686t+352.7
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
Using graphing utility to find the graph of linear regression model and coefficient of determination.
The above graph show linear model of given data.
The model is P=7.5686t+352.7
The coefficient of determination is 0.9786
To graph: The data of the table and find the power model.

Answer to Problem 33E
P=248.55t0.2351
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
Using graphing utility to plot the points and draw the graph.
The above graph show power model of given data.
The model is P=248.55t0.2351
The coefficient of determination is 0.9438
To graph: The data of the table and find the exponential model.

Answer to Problem 33E
P=366.63(1.016)t
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
Using graphing utility to plot the points and draw the graph.
The above graph show exponential model of given data.
The model is P=366.63(1.016)t
The coefficient of determination is 0.9866
To graph: The data of the table and find the logarithmic model.

Answer to Problem 33E
P=168.58+111.66lnx
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
Using graphing utility to plot the points and draw the graph.
The above graph show logarithmic model of given data.
The model is P=168.58+111.66lnx
The coefficient of determination is 0.9289
To choose: The best fit model for given data.

Answer to Problem 33E
Exponential model
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
There are total four different model for same data with coefficient of determination.
Linear model, P=7.5686t+352.7
Coefficient of determination, r2=0.9786
Power model, P=248.55t0.2351
Coefficient of determination, r2=0.9468
Exponential model, P=366.63(1.016)t
Coefficient of determination, r2=0.9866
Logarithmic model, P=168.58+111.66lnx
Coefficient of determination, r2=0.9289
In all above model, the best coefficient of determination nearest to 1 for exponential model.
So, choose exponential model.
To predict: The populations of Luxembourg for the years 2014 through 2018.

Answer to Problem 33E
Exponential model
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
There are total four different model for same data with coefficient of determination.
Linear model, P=7.5686t+352.7
Coefficient of determination, r2=0.9786
Year20142015201620172018t2425262728PLinear534.4541.9549.5557.1564.6
Power model, P=248.55t0.2351
Coefficient of determination, r2=0.9468
Year20142015201620172018t2425262728Ppower524.7529.7534.7539.4544.1
Exponential model, P=366.63(1.016)t
Coefficient of determination, r2=0.9866
Year20142015201620172018t2425262728Pexp539.8545.2553.9562.8571.8
Logarithmic model, P=168.58+111.66lnx
Coefficient of determination, r2=0.9289
Year20142015201620172018t2425262728Plog523.4527.9532.4536.6540.6
In all above model, the best choose exponential model.
To choose: The best model for population.

Answer to Problem 33E
Exponential model
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
There are total four different model for same data with coefficient of determination.
Linear model, P=7.5686t+352.7
Coefficient of determination, r2=0.9786
Year20142015201620172018t2425262728PLinear534.4541.9549.5557.1564.6
Power model, P=248.55t0.2351
Coefficient of determination, r2=0.9468
Year20142015201620172018t2425262728Ppower524.7529.7534.7539.4544.1
Exponential model, P=366.63(1.016)t
Coefficient of determination, r2=0.9866
Year20142015201620172018t2425262728Pexp539.8545.2553.9562.8571.8
Logarithmic model, P=168.58+111.66lnx
Coefficient of determination, r2=0.9289
Year20142015201620172018t2425262728Plog523.4527.9532.4536.6540.6
In all above model, the best choose exponential model.
To verify: The choice of model for parts (e) and (g).

Answer to Problem 33E
Exponential model
Explanation of Solution
Given: The populations P (in thousands) of Luxembourg for the years 1999 through 2013 are shown in the table, where t represents the year, with t=9 corresponding to 1999.
Year199920002001200220032004200520062007200820092010201120122013t91011121314151617181920212223P427.4433.6439.0444.1448.3455.0461.2469.1476.2483.8493.5502.1511.8524.9537.0
Yes, In both parts models same. That is exponential model.
Chapter 3 Solutions
Precalculus with Limits: A Graphing Approach
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