Results from a January 2008 telephone survey conducted by Gallup showed that 57% of urban Colombian adults
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Results from a January 2008 telephone survey conducted by Gallup showed that 57% of urban Colombian adults support a free trade agreement (FTA) with the United States. Gallup used a cluster sample in which the cities of Bogotá, Cali, Barranquilla, and Medellín provided a representative sample of 1000 urban Colombians aged 15 and older.
a) What is the parameter being estimated? What is the population? What is the sample size?
b) Check the conditions for making a confidence interval.
c) Construct a 95% confidence interval for the fraction of Colombians in agreement with the FTA.
d) Explain what this interval means.
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a The parameter is the proportion of urban Colombians who agree with ...View the full answer
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ISBN: 9780133899122
3rd Canadian Edition
Authors: Norean D. Sharpe, Richard D. De Veaux, Paul F. Velleman, David Wright
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