9. In a random sample of 900 school boys from a school A, 20% were found to have defective eye sight. In another school B, 15% of random sample of 1900 school boys had the same defect. Is the difference between two percentages significant
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Answer:
3.75%, insignificant
Step-by-step explanation:
School A, defective eye sight= 20%of900=20*900/100=180
School B, defective eye sight=
15%of1900=15*1900/100=285
Difference=285-180=105
Total students= 900+1900=2800
%=105/2800*100=3.75%
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