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 :

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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. Bill Lane:

   This is really an acid test on whether members of Congress believe in looking outward or looking inward.

2. Bruce Bennett:

   If North Korea were to test some number of ballistic missiles by firing them into the East Sea/Sea of Japan, these warships would have the potential of intercepting the North Korean test missile.

3. Donald Trump:

   The test result comes back in five minutes, and we have great testing. Or they wouldn't be allowed to travel with me, it's not my choice ; it's a very strong group of people that want to make sure they are tested, including Secret Service.

4. Robbert Van Batenburg:

   The more conservative voices in the House essentially threw a wrench into Boehner's efforts to get DHS funding going, and I think maybe this serves as a litmus test for what they can do in the fall.

5. Shore Capital analyst Clive Black:

   It's going to be a really big test of the CMA's understanding of the market and whether it believes that this deal is in the consumer's interest, it's hard to believe it would not require considerable store disposals and there aren't many buyers out there.

References

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