# Calculate Error Percentage - Excel by ecb12316

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Calculate Error Percentage document sample

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```									                                      Calculating a Statistically Valid Sample Size

x      =   1.96       2      *       PQ                                           n       =         x
p                                                                                 1+         (x-1)
N=   Population Size                                  N
p=   Desired Precision Level
Population  =   351,526                                   P=   Expected Rate of Perfomance
Precision   =       3.00                                  Q=   100 - P
Performance =      99.00

x =   1.96       2          *            99.00         1.00                        n =               42.2576
3.00
1+    42.2576 -1
= 0.6533333 2             *              99                                                        351526

=               42.2576
= 0.4268444               *              99
1+     41.2576
351526
x =       42.3
=              42.2576
1+ 0.000117367
Population Size                                351,526
Confidence Level (usually 95%)                     95%              =              42.2576
Expected Error rate not over                      1.0%                            1.000117
Precision percentage of Plus or Minus             3.0%
Valid Statistically valid sample size            42

```
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