Chi-square is a distribution used to analyze the standard deviation of two samples. A t-distribution on the other hand, is used to compare the means of two samples.
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What is the difference between 392 and 247?
the difference is also doubled
There is no difference in value between "equal" fractions: the difference is zero.
A "difference" is either the result of a subtraction (the difference between 7 and 5 is 7 minus 5), or its absolute value (so that the difference between 7 and 5 is the same as the difference between 5 and 7).
It is a 26.087% difference between 50 and 65