Given
Confidence Interval = 95%
So Level of Siginfcance =
= 5% = 0.05
Therefore
Given Marginal Error =
= 200
Population S.D =
= 1300
We know that
OPTION (a)
NOTE: To See the Critical Values of Z; we use the Standard Normal area tabulated values which i posted below.
How to see?
If alpha = 5% the confidence interval = 95% Or Vice Versa
Divide the value 95 with 100. you will get 0.95 and after that divide the value 0.95 with 2; you will get 0.475. Now Search this 0.475 in side the table ( repeating again see inside the table). You will find this at the intersection of (1.9, 0,06) which is Zcri value i.e 1.96.
Like this you can find the Zcri for any alpha values.
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