Hey guys i assume this is probably a really basic question, but its giving me trouble. I have only recently taken up stat study and have a limited maths background.
So anyway as the title states i have to conduct a two-sided test given the following info:
Population Standard Deviation = 9.2
Sample Mean = 85
Population Mean = 76.4
Level of significance = 0.05
Sample Size = 25
Degrees of Freedom = 24
So i tried to calculate the z-stat, using (85-76.4)/(9.2/sqrt(25)) = 4.7
I'm not sure what i have done wrong but im fairly sure the z-stat shouldn't be that big.
So anyway as the title states i have to conduct a two-sided test given the following info:
Population Standard Deviation = 9.2
Sample Mean = 85
Population Mean = 76.4
Level of significance = 0.05
Sample Size = 25
Degrees of Freedom = 24
So i tried to calculate the z-stat, using (85-76.4)/(9.2/sqrt(25)) = 4.7
I'm not sure what i have done wrong but im fairly sure the z-stat shouldn't be that big.