1.

A wholesaler in apples claims that only 4 % of the apples supplied by him are defective. A random sample of 600 apples contained 36 defective apples. Calculate the standard error concerning good apples.

Answer»

Sample size = 600 

No. of defective apples = 36 

Sample proportion p = 36/600 = 0.06 

Population proportion P = probability of defective apples = 4% = 0.04 

Q = 1 – P = 1 – 0.04 = 0.96 

The S.E for sample proportion is given by S.E

= √PQ/N 

= √(0.04)(0.96)/600 

= √0.000064 

= 0.008 



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