Correlations Fill in Multiple Blanks Interactive

Type your answers in the blanks and click Submit.

Question 1
The data below shows the population of the United States in ten-year increments from 1915 to 2015.

Year (x)	Population (y)
1915	100546000
1925	115829000
1935	127250232
1945	139928165
1955	165931202
1965	194302963
1975	215973199
1985	238069579
1995	266474371
2005	295689445
2015	320304889

Population growth usually models an exponential association. Conduct an exponential regression analysis on the data above. (Note: This problem uses very large numbers. Check that your calculator MODE is set to “Float 9” for decimal places. The steps to do this can be found in the Student Resources section.)

Type the correct number in each blank to complete the statements below:

Submit

Answer: Correct! Go to question 2. Incorrect. The answer is: The exponential regression equation that models this data is y equals thirteen thousand thirty one millionths times one and one thousand one hundred ninety seven hundred thousandths to the power of x. An exponential regression results in a correlation coefficient of 0.99728 and a coefficient of determination of 0.994567.

Go to question 2. One or more of your answers are incorrect. Try again. Be sure to find an exponential regression equation. Remember, the r value represents the correlation coefficient and the R squared a coefficient of determination.