What is the effect on the standard error (SE) if we choose a sample size of N=100 rather than the old value of 900?
Solution :
If we decrease the sample size the standard error will increases .
For example .
= 10
N = 900
= / N = 10 / 900 = 0.33
If we tale, N = 100
= / N = 10 / 100 = 1
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