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The T-test test is not suitable for all tables.
• The value of T will be zero if there is no difference in the data.
• The simplest use of the one-sample T-test is when testing whether the mean of a variable already coded in columns of the data is zero.
• There may be occasions when you want to use a one-sample T-test on values that are not the same as those in the data.
• To test whether a mean may be different from a non-zero value, subtract that value from each data value. In other words, to test whether the mean number of visits to a supermarket is equal to 2, you actually test whether the mean of (number of visits to supermarket – 2) is equal to 0.
• To make a paired test between two data values, test whether the difference between them is zero.