- #1
Aerodynamic20
- 18
- 0
Homework Statement
The determination of iodine in sea water gave a mean value of 46.43 μg/L and a sample standard deviation ss of 1.37 μg/L.
What is the minimum number of samples (N) which must be analyzed to have 95% confidence that the mean value differs from the true value by no more than 2.0%?
Homework Equations
u-x(bar)= +/- ts/rt(n) -------> n=(t^2)(s^2)/((u-x)^2)
The Attempt at a Solution
I know from the confident interval, the minimum at 95% is 1.96=t, s=1.37, e=0.02,
where am I going wrong?
Help please
Last edited: