To obtain 90% confidence limits for a binomial proportion from a one-way table with PROC FREQ, which option must you include in the TABLES statement?

To obtain 90% confidence limits for a binomial proportion using PROC FREQ in SAS, specifying the alpha level correctly is crucial. The confidence level is calculated as 1 minus the alpha value. Therefore, to achieve a 90% confidence interval, you need an alpha value that corresponds to that confidence level.

When the alpha level is set to 0.1, it allows for the remaining 90% of the confidence distribution. This means that 10% (or 0.1) is split into two tails of the distribution, leading to a confidence interval that captures the true proportion 90% of the time.

The selection of an alpha value of 0.1 ensures that you are targeting the desired level of confidence when conducting your analysis. Hence, using "BINOMIAL ALPHA=0.1" is the appropriate choice to achieve 90% confidence limits for the binomial proportion in this context.