A Researcher Wishes to Test $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 0$

A researcher wishes to test $H _ { 0 } : \mu _ { 1 } - \mu _ { 2 } = 0$
Versus $H _ { a } : \mu _ { 1 } - \mu _ { 2 } \neq 0$
) A sample of 100 observations from each population yields $\bar { x } _ { 1 }$
= 75 and $\bar { x } _ { 2 }$
= 82.If $\sigma _ { 1 }$
= 3 and $\sigma _ { 2 }$
= 2,compute Cohen's d.

A) 1.45
B) 2.74
C) 0.32
D) 1.28
E) 0.66