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This web page benjamin-low.blogspot.com states the following, "Basically in order to give meaning to any of the data gathered, we should first test for Cronbachs alpha mean alpha, then check to see if the items questions are unidimensional measuring only one thing using the Factor command." We saw that the webpage said " Next, group the items that are seemingly measuring the same dimension and test for reliability alpha again." It also said " A high reliability between items indicates correlation. How do we use the T-test. First we need to look at the mean of the pre-data, mea."