excelt-test
Why does Excel t-test return #DIV/0! error?
I'm testing the t.test functionality of Excel and when I specify two-sided, paired with two lists of 1,2,3,4,5,6,7 and 2,3,4,5,6,7,8, paired t-test, the p-value returns #DIV/0! I have made sure the cell is formatted as number. As soon as I change the last number 8 of the second list to 9, the result becomes normal.
Solution
Thanks to @Axel Richter, the equation for paired student t-test has standard deviation of each paired difference in the denominator. since the difference between each pair is the same, the standard deviation is 0, which makes the denominator 0.
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