What is the value of the denominator? Assuming that standarddeviation = s1 = 1.17 standard deviation

What is the value of the denominator? Assuming that standarddeviation = s1 = 1.17 standard deviation= s2 = 1.26 Group 1 Group 2 3 5 4 5 3 6 4 5 5 7 6 8 ​ a. 2.45 b. -.7 c. 15.78 d. .7 . . .

 

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