Table rows show the whole number and tenths place of the z-score. Table columns show the hundredths place. The table shows that the probability that a standard normal random variable will be less than -1.31 is 0.0951; that is, P(Z -1.31) 0.0951. AP Statistics Tutorial. Generally, in elementary stats and AP stats, you’ll use a z-score in testing more often than a t score. The table I am talking about is the z-table. AP Statistics students know the formula to find the z-score of a data point, but many of them do not know where the values on the table come from.

In statistics, the Gaussian or Normal Distribuition is one of the most frequently encountered probability density functions. Z-score tables are based on a normal distribution that has a mean of 0 and a standard deviation of 1. Since a z-score table contains a small finite subset of values, you often must settle for an approximation. If Ha contains a less-than alternative, find the probability that Z is less than your test statistic (that is, look up your test statistic on the Z-table and find its corresponding probability).

Use a z-table to find the probability of a particular measurement. This version of the table is in Murdoch and Barnes Statistical tables. The value of a, called the percentage point, is given along the borders of the table (in bold) and is to 2 decimal places. The values in the main table are probabilities that Z is GREATER THAN a. We explain How to Find a P-Value from a Z-Test Statistic with video tutorials and quizzes, using our Many Ways(TM) approach from multiple teachers. p This lesson will explain how to find a p-value when given the z-test statistic by using either a z-table or technology.

### How To Read A Z-score Table To Compute Probability

1 General Advance-Placement (AP) Statistics Curriculum – Non-Standard Normal Distribution and Experiments: Finding Probabilities 1. 386380, which can be computed using the SOCR Normal Distribution Calculator or the SOCR Standard Normal Z Table via the standardizing transformation. Ap Statistics, Real Confidence, Table. Z table: Ap Statistics, Real Confidence, Table Brianna DeBrabander. Saved by. Brianna DeBrabander. Visit. Z table. 2y.