Quiz 4.1B

# Quiz 4.1B - data What is the correlation coefficient Is this correlation between YEAR and FED DEBT Explain briefly 3 Now transform your linear

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QUIZ 4.1B AP Statistics Name: The following table shows the federal debt for the years 1980 through 1991. Federal Debt Year (in trillions) 1980 0.909 1981 0.994 1982 1.1 1983 1.4 1984 1.6 1985 1.8 1986 2.1 1987 2.3 1988 2.6 1989 2.9 1990 3.2 1991 3.6 1. Construct a scatterplot on the grid provided. Perform an appropriate test to show that the data are (approximately) exponential . 2. Calculate the logarithms of the y-values and extend the table above to show the transformed data (just write the first four logs). Then perform least square regression on the transformed data. Write the LSRL equation for the transformed

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Unformatted text preview: data: What is the correlation coefficient? Is this correlation between YEAR and FED. DEBT? Explain briefly. 3. Now transform your linear equation back to obtain a model for the original federal debt data. (It should be in the form y = c10 kx ) Write the equation for this model. 4. Compare your models predictions for 1990 and 1991 to the actual federal debt. 5. Use your model to predict the national debt in the year 2000. 6. What is it called when you predict for a point outside the range of your data? Chapter 4 Chapter 4...
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## This note was uploaded on 12/26/2009 for the course MATH 212 taught by Professor Mr.brown during the Spring '09 term at Louisiana College.

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Quiz 4.1B - data What is the correlation coefficient Is this correlation between YEAR and FED DEBT Explain briefly 3 Now transform your linear

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