Following the procedures in Demonstration 6.1, select three samples from the 2006 GSS database: 15%, 30%, and 60%. Get descriptive statistics for age (don’t forget to get the standard error), and use the results to complete the following table:

154 PART II INFERENTIAL STATISTICS 12 3 4 5 6 Sample Sample Sample Standard Sample Mean Sample Mean

% Size Mean Error Standard Errorfdas Mean-Population 15%

30%

60%

Summarize these results. What happens to standard error as sample size increases?

Why? How accurate are the estimates (sample means)? Are all sample means within a standard error of 46.88? How does the accuracy of the estimates change as sample size changes?