Solution :
Given ,
= 6.5 ..Population SD
E = 10 Margin of error
c = 90% = 0.90 ...confidence level
Find sample size required.
c = 0.90
= 1- c = 1- 0.90 = 0.10
/2 = 0.05
Using Z table ,
= 1.645
Now, sample size (n) is given by,
= {(1.645* 6.5 )/ 10 }2
= 1.143295
= 2 ..(round to the next whole number)
Answer : Required Sample size is n = 2
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