13.28 Regression for human development A study investigated an index of human development in a South American
Question:
13.28 Regression for human development A study investigated an index of human development in a South American country, which had y = 27.3 and s = 5.5. Two explanatory variables were x1 = literacy rate in percentage
(mean = 44.4, s = 22.6) and x2 = daily per capita income in dollars (mean = 56.6, s = 25.3). Based on a random sample of 50 cities in the country, some regression results are also shown as follows:
a. Find the 95% confidence interval for b1.
b. Explain why the interval in part a means that an increase of 10 units in literacy rate corresponds to anywhere from a 0.4- to 1.7-unit increase in mean human development, controlling for daily per capita income. (This lack of precision reflects the small sample size.)
Step by Step Answer:
Statistics The Art And Science Of Learning From Data
ISBN: 9781292164878
4th Global Edition
Authors: Alan Agresti, Christine A. Franklin, Bernhard Klingenberg