Since the LOWER and UPPER LIMITs of the confidence interval are: $3.37, and $3.89, respectively, we can say that:

  x   -  E  =  3.37 ------ eq (i)

  x  +  E  =  3.89 ------ eq (ii)

         2x  =  7.26 ------ Adding eqs (ii) & (i)

          x, or 



3.63 - E = 3.37 ------ Substituting 3.63 for x in eq (i)

        - E = 3.37 - 3.63

        - E = - .26

          E, or  

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