17. H1

17) The table below shows the number of live births per 1000 women aged 15–44 years in the United States, starting in 1965. (National Center for Health Statistics, ww.cdc.gov/nchs/).

Year: 1965, 1970, 1975, 1980, 1985, 1990, 1995, 2000, 2005

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Rate:  19.4    18.4   14.8   15.9   15.6   16.4   14.8,  14.8  14.0

a) Make a scatterplot and describe the general trend in Birthrates. (Enter Year as years since 1900: 65, 70, 75, etc.) The data is in file birthrates.xls

 

b) Find the equation of the regression line.

 

c) Interpret the slope of the line.

 

d) The table gives rates only at 5-year intervals. Estimate what the rate was in 1978.

 

e) In 1978 the birthrate was actually 15.0. How close did your model come? f) In 2009, the birthrate was 13.5. How close did your model come? g) Predict the Birthrate for 2025. Comment on your faith in this prediction.