Notice that all the values for z in the first column are positive. Here is a full picture of the positive z-table. How to Use the Z-Table for Positive Z-Scores Even better, try the fantastic Normal CDF calculator here! But, if you are using a z-table, read on. You may have a calculator with a normal cumulative distribution function (normalCDF) like the TI 84. Some teachers require students to use z-tables, but there are other ways to find area under the normal curve. And finally, I’ll guide you through finding area given z-scores. Using some simple subtraction, you can also find the area to the right of a z-score, or the area between z-scores with the z-table. The z-table is a chart of numbers that we use to identify the area under the normal curve to the left of a z-score. In this article, I’ll walk you through how to use the z-table, or z-score table.
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