Statistics Workbook For Dummies with Online Practice, 2nd Edition

Appendix

Tables for Reference

This appendix includes tables for finding probabilities and/or critical values for the three distributions used in this book: the Z-distribution (standard normal), the t-distribution, and the binomial distribution. I explain how to use each table since they are all a bit different.

Z-Table

The Z-table shows less-than-or-equal-to probabilities for the Z-distribution; that is, for a given z value. (See Chapter 6 for more on the Z-distribution.) To use this table, do the following:

1. Determine the z-value for your particular problem.

   The z-value should have one leading digit before the decimal point (positive, negative, or zero) and two digits after the decimal point; for example , , or 0.13.

2. Find the row of the table corresponding to the leading digit and first digit after the decimal point.

   For example, if your z-value is 1.28, look in the “1.2” row; if , look in the “” row.

3. Find the column corresponding to the second digit after the decimal point.