It depends on the population.
Use t-test for a small population, N < 30; otherwiase, apply z-test or when N>=30.
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You use a z test when you are testing a hypothesis that is using proportions You use a t test when you are testing a hypothesis that is using means
5. The manufacturer of a spot remover claims that his product removes 90 percent of all spots. In a random sample, the spot remover removes 11 of 16 stains. Write the null and alternative hypotheses.
statistic is a test used to test a hypothesis andestimation is finding the cost before it has been actually manufactured
statistic is a test used to test a hypothesis andestimation is finding the cost before it has been actually manufactured
A regression test is a test where a previously known bug is tested for after a change. A retest is simply repeating a test.