### What does **z-test** mean?

# Definitions for z-test

z-test

#### This dictionary definitions page includes all the possible meanings, example usage and translations of the word **z-test**.

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### Wikipedia

Z-test

A Z-test is any statistical test for which the distribution of the test statistic under the null hypothesis can be approximated by a normal distribution. Z-test tests the mean of a distribution. For each significance level in the confidence interval, the Z-test has a single critical value (for example, 1.96 for 5% two tailed) which makes it more convenient than the Student's t-test whose critical values are defined by the sample size (through the corresponding degrees of freedom). Because of the central limit theorem, many test statistics are approximately normally distributed for large samples. Therefore, many statistical tests can be conveniently performed as approximate Z-tests if the sample size is large or the population variance is known. If the population variance is unknown (and therefore has to be estimated from the sample itself) and the sample size is not large (n < 30), the Student's t-test may be more appropriate. How to perform a Z test when T is a statistic that is approximately normally distributed under the null hypothesis is as follows: First, estimate the expected value μ of T under the null hypothesis, and obtain an estimate s of the standard deviation of T. Second, determine the properties of T : one tailed or two tailed. For Null hypothesis H0: μ≥μ0 vs alternative hypothesis H1: μ<μ0 , it is upper/right-tailed (one tailed). For Null hypothesis H0: μ≤μ0 vs alternative hypothesis H1: μ>μ0 , it is lower/left-tailed (one tailed). For Null hypothesis H0: μ=μ0 vs alternative hypothesis H1: μ≠μ0 , it is two-tailed. Third, calculate the standard score :

### Numerology

Chaldean Numerology

The numerical value of z-test in Chaldean Numerology is:

**5**Pythagorean Numerology

The numerical value of z-test in Pythagorean Numerology is:

**9**

### Examples of z-test in a Sentence

This is going to be an enormous stress test for our communications networks.

The message we want to get out is if you think you’ve got celiac disease, don’t just go on a gluten-free diet, test for it. i hope doctors keep in mind that celiac disease is a very frequent food intolerance, which should be investigated not only in patients with diarrhea and overt malabsorption, but also in people (with other symptoms).

What I had was not caused by a cholesterol buildup or anything except it was DNA, i got my dad’s genes for a calcium buildup in my arteries. … There’s much more than just appearance. … A test needs to be done. I had a scan that showed I had a 90 percent blockage. I had no idea.

We're actually going to use the DPA for the first time today. There are some test kits we need to get our hands on, we're going to use it when we need it and we're going to use it today.

A whole lot of people are trying to give this a grade before the test is taken.

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"z-test." *Definitions.net.* STANDS4 LLC, 2024. Web. 10 Aug. 2024. <https://www.definitions.net/definition/z-test>.

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