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A brief explanation of the difference between beta and alpha test is that alpha test is usually in-house and is part of basic development. Beta test is right before product release and typically includes customer input.
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A regression test is a test where a previously known bug is tested for after a change. A retest is simply repeating a test.
Qualitative test represents the substance and a quantitative test shows the amount.First Deals with descriptions, second one with numbers
statistic is a test used to test a hypothesis andestimation is finding the cost before it has been actually manufactured