a) Using the data only up to 2009 (as in the NYTimes article), find the equation of the regression line for predicting the number of twin births by Years since 1980 . b) Explain in this context what the slope means. c) Prediet the number of twin births in the United States for the year 2014. Then compare your prediction to the actual value. d) Fit a new regression model to the entire data sequence. Comment on the fit. Now plot the residuals. Are you satisfied with the model? Explain. Twins by year 2014 In January 2012, the New York Times published a story called Twin Births in the U.S., Like Never Before, in which they reported a 76 percent increase in the rate of twin births from 1980 to 2009. Here are the number of twin births each year (per 1000 live births). (www.cdc .gov/nchs/births.htm).

1. a) Using the data only up to 2009 (as in the NYTimes article), find the equation of the regression
line for predicting the number of twin births by Years since 1980 . b) Explain in this context
what the slope means. c) Prediet the number of twin births in the United States for the year 2014.
Then compare your prediction to the actual value. d) Fit a new regression model to the entire
data sequence. Comment on the fit. Now plot the residuals. Are you satisfied with the model?
Explain.
Twins by year 2014 In January 2012, the New York Times published a story called Twin Births
in the U.S., Like Never Before, in which they reported a 76 percent increase in the rate of twin
births from 1980 to 2009. Here are the number of twin births each year (per 1000 live births).
(www.cdc .gov/nchs/births.htm)