Statistics questions

Statistics
Tutor: None Selected Time limit: 1 Day

Apr 13th, 2015

Standard error = sqrt(0.6812/82+0.2082/109) = 0.077798

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. 


Apr 13th, 2015

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Apr 13th, 2015
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Apr 13th, 2015
Dec 11th, 2016
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