Homework Answers
Given ME = 3, 
= 22, 
= 0.05
The Zcritical at
= 0.05 is 1.96
The ME is given by :
Squaring both sides we get: (ME)2 = (Z
critical)2 *
2/n
Therefore n = (Zcritical *
/ME)2 = (1.96 * 22/ 3)2 = 206.59
Therefore n = 207 (Taking it to the next whole number)
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ME = Zcritical *
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