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Q: What statistical test should I use?

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Kruskal-Wallis H test.

You can use the z test for two proportions. The link below will do this test for you.

statistical goodness of fit test used for categorical data to test if a sample of data came from a population with a specific distribution. It can be applied for discrete distributions.

It can be, but it is also a statistical distribution in its own right - on which the test is based.

The power of a statistical test is the probability that the test will reject the null hypothesis when it is, in fact, false. Please see the link.

You know nothing about how to use statistical analysis to verify or test validity, do u.

t-test

* Always when the assumptions for the specific test (as there are many parametric tests) are fulfilled. * When you want to say something about a statistical parameter.

Yes. It is a statistical test.

What is the use of statistical inference in technology?

Parametric statistical tests assume that your data are normally distributed (follow a classic bell-shaped curve). An example of a parametric statistical test is the Student's t-test.Non-parametric tests make no such assumption. An example of a non-parametric statistical test is the Sign Test.

The power of a statistical test is defined as being a probability that a test will product a result that is significantly different. It can be defined as equaling the probability of rejecting the null hypothesis.

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