Trade agreementresults from a january 2008 telephone survey, Ask an Expert

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Trade agreement

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 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. Do you believe that you can be this confident about your result? Why or why not?

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