DOWNLOADS
Updated Feburary 8, 2002

Download a free statistics spreadsheet.

This easy-to-use Microsoft Excel spreadsheet calculates:

• Sampling error and desired sample size given specified criteria.
• Test of proportions for two independent groups using a z-test under a pooled or separate variance assumption for specified proportions and sample sizes.
• Test of means for two independent groups using a t-test under a pooled or separate variance assumption for specified means, std. deviations, and sample sizes.
• Test of proportions for four-cell test/control designs using a z-test under a pooled or seperate variance assumption for specified proportions and sample sizes.