Calculate the normal time for the job, Operation Management

A work  sampling  study  is to  be made of a typist  pool. It is  left that  typists are idle  30 % of the  time. How many observations  should  be made  in order  to  have 395.5%  confidence so that  so that  the accuracy  within +    4%.


Number  of observation required for  work  sampling study=

             N = c2 pq / E2

 Where c  =  constant  depending  on confidence level

 P =  percentage of iding q  percentage of activity  E = absolute error

 C= 2  for  95.5%  confidence level  p = 0.3 , q = 1- p = 0.7, E = 4 % = 0.04

  N =  4X 0.3X 0.7 / 0.04 2= 0.84 /0.0016= 525

Posted Date: 2/25/2013 6:23:08 AM | Location : United States

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