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1 As it not possible makes it software application is defect free but testing will be necessary. 2  Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment. Most important thing of testing is the development environment is different than the Testing environment and the testing done on testing environment is similar to the Production environment.
The central reason we do hypothesis testing is to decide whether or not the sample data are consistent with the null hypothesis. In the second step of the procedure we identify the kind of data that is expected if the null hypothesis is true. Specifically, we identify the mean we expect if the null hypothesis is true.