Answers for "Check Yourself" questions

(1) per capita birth rate (B/N) for US = 0.013 and per capita death rate (D/N) for US = 0.008 (Click here to return to the section of notes that sent you to this question.)

(2) Crude birth rate for US = approximately 13 per 1000 persons

(calculated from N of approximately 316 million persons, and approximately 4.1 million births [= (4.1 million / 316 million) X 1,000])

Crude death rate for US = 8 per 1000 persons

(calculated from N of approximately 316 million persons, and approximately 2.5 million deaths, as above for crude birth rate)

(Click here to return to the section of notes that sent you to this question.)

(3) r = b-d therefore r =(0.013 - 0.008) = 0.005 for the US in 2013 (Click here to return to the section of notes that sent you to this question.)

(4) G = (b-d)*N = rN = 0.005 * 316 million = ~ 1.58 million persons = current population growth rate (net gain) for US per year (Click here to return to the section of notes that sent you to this question.)

(5) No, we are growing at about 1.58 million persons per year INDEPENDENT of immigration. This number of people being added to the US population each year is more than twice the number being added by net immigration into the US each year (which was estimated to be about 632,000 persons per year in 2013) (Click here to return to the section of notes that sent you to this question.)

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This page is maintained by Patricia Muir at Oregon State University. You can address questions or comments to me at (muirp@science.oregonstate.edu) . Page last updated Nov 5, 2013.

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