RESEARCH METHODS HANDBOOK

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Contents	Introduction	Descriptive	Hypothesis	Tables	Appendix

Example: Interval Estimation for Proportions

Problem: A random sample of 500 employed adults found that 23% had traveled to a foreign country. Based on these data, what is your estimate for the entire employed adult population?

N=500, p = .23 q = .77

Use alpha .05 (i.e., the critical value is 1.96)

Estimate Sampling Error

Compute Interval

Interpret

You are 95% confident that the actual proportion of all employed adults who have traveled to a foreign country is between 19.3% and 26.7%.