Standard error = sqrt(0.6812/82+0.2082/109)
z = (9.09-9.22) /0.077798 = -0.13/0.077798 = -1.67
| z | = 1.67
Since we are having two sided alternative, we will only take the magnitude and not the sign.
I am not sure whether they feed the answer as 1.67 or -1.67
That is why I am posting both the values.
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