PROCEEDINGS of the HUMAN FACTORS AND ERGONOMICS SOCIETY 49th ANNUAL MEETING-2005 2104 Acknowledgements We'd like to thank Lynda Finn of Statistical Insight for providing the Monte Carlo macro in Minitab and assistance with interpreting the statistical literature. We'd also like to thank Erika Kindlund of Intuit for providing the large sample completion rates. References Agresti,A.,and Coull,B.(1998).Approximate is better than 'exact'for interval estimation of binomial proportions.The American Statistician,52,119-126. Clopper,C.J.,and Pearson,E.(1934).The use of confidence intervals for fiducial limits illustrated in the case of the binomial.Biometrika.26.404-413. Landauer,T.K.(1997).Behavioral research methods in human-computer interaction.In M.Helander,T.K. Landauer,and P.Prabhu (Eds.),Handbook of Human- Computer Interaction(pp.203-227).Amsterdam, Netherlands:North Holland. Laplace,P.S.(1812).Theorie analytique des probabilitites.Paris,France:Courcier. Lewis,J.R.(1996).Binomial confidence intervals for small sample usability studies.In G.Salvendy and A. Ozok (eds.),Advances in Applied Ergonomics: Proceedings of the Ist International Conference on Applied Ergonomics--ICAE '96(pp.732-737). Istanbul,Turkey:USA Publishing. Sauro,J.(2004).Restoring confidence in usability results.From Measuring Usability,article retrieved Jan 2005 from http://www.measuringusability.com/conf intervals.htm Wilson,E.B.(1927).Probable inference,the law of succession,and statistical inference.Journal of the American Statistical Association.22.209-212.Acknowledgements We’d like to thank Lynda Finn of Statistical Insight for providing the Monte Carlo macro in Minitab and assistance with interpreting the statistical literature. We’d also like to thank Erika Kindlund of Intuit for providing the large sample completion rates. References Agresti, A., and Coull, B. (1998). Approximate is better than ‘exact’ for interval estimation of binomial proportions. The American Statistician, 52, 119-126. Clopper, C. J., and Pearson, E. (1934). The use of confidence intervals for fiducial limits illustrated in the case of the binomial. Biometrika, 26, 404-413. Landauer, T. K. (1997). Behavioral research methods in human-computer interaction. In M. Helander, T. K. Landauer, and P. Prabhu (Eds.), Handbook of Human￾Computer Interaction (pp. 203-227). Amsterdam, Netherlands: North Holland. Laplace, P. S. (1812). Theorie analytique des probabilitites. Paris, France: Courcier. Lewis, J. R. (1996). Binomial confidence intervals for small sample usability studies. In G. Salvendy and A. Ozok (eds.), Advances in Applied Ergonomics: Proceedings of the 1st International Conference on Applied Ergonomics -- ICAE '96 (pp. 732-737). Istanbul, Turkey: USA Publishing. Sauro, J. (2004). Restoring confidence in usability results. From Measuring Usability, article retrieved Jan 2005 from http://www.measuringusability.com/conf_intervals.htm Wilson, E. B. (1927). Probable inference, the law of succession, and statistical inference. Journal of the American Statistical Association, 22, 209-212. PROCEEDINGS of the HUMAN FACTORS AND ERGONOMICS SOCIETY 49th ANNUAL MEETING—2005 2104