Given E = 0.02 

 N = 500 



t = 2 (for a probability of approximately 

 95 percent) . 



Then, n = 



(2) 2 (0.0134) 



(0 .02) 2 + < 2 ) 2 <° g 13 ^) 



0.0536 

 0.000507 



= 106 . 



-7- 



