Definitions for z-test
z-test

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1. 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 :

How to pronounce z-test?

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How to say z-test in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of z-test in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of z-test in Pythagorean Numerology is: 9

Examples of z-test in a Sentence

1. Susan Lucci:

   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% blockage. I had no idea.

2. Barbara Bradley Baekgaard:

   The Kappa [ Kappa Gamma women's sorority ] house at Michigan State, Kappa Gamma women kind of brag that Kappa Gamma women started the company, kappa Gamma women were Barbara Bradley Baekgaard first test market, and it just grew from there.

3. Senate Minority Leader Harry Reid:

   As we speak, Donald Trump is proposing to ban Muslim immigration. Other leading candidates are proposing a religious test, tossing around slurs on a daily basis, and now a Republican-appointed justice endorsing racist ideas from the Supreme Court bench. The only difference between the ideas endorsed by Trump and Scalia is that Scalia has a robe and a lifetime appointment. Ideas like this don't belong on the Internet, let alone the mouths of national figures.

4. David Blennerhassett:

   The transaction will require various regulatory approvals, which will stress-test the world's understanding of Hong Kong's 'one country, two systems' constitution, it will be politically tough now and in the near-term to get this through various regulatory channels.

5. Jennifer Mascia:

   They actually had to pass a shooting test. So, you went to a shooting range and you had to make 11 out of 20 shots on a target in front of an instructor.

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Z-Test