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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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 can use the z test for two proportions. The link below will do this test for you.
The statistical problem helps to describe the whole issue of descriptive and inferential statistics. The main aspects of the statistical problems are the population should be clearly defined and also objectives.
Kruskal-Wallis H test.
t-test is the statistical test used to find the difference of mean between two groups