##### How can I read this summation?

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If you have all the data, what do you do? Sum up all the z,P,Pvg values at once? Or do you do run three separate calculations? How does one interpret this summation?

Nov 18th, 2015

Hello.  When you are talking about a set of data, I assume you have data from a set of observations.  Say there are  n  number of values you have collected.  Let X represent a value from this set.  X is your random variable.

We assume X is normal because you want to calculate the Z-value or Z-score, and P-value.

The Z-score is found from the formula :   Z-score =  (X  -  (average)) / [(standard-deviation) / sqrt(n) ]

The p-value is found from the Z-score:   p-value = P ( Z > (Z-score) ),   you find the p-value from the z-score table.,  P-value is the area under the standard normal curve to the right of the z-score.

Nov 18th, 2015

Thanks for the reply ! My question is simple but the picture didn't load from last time. If you have a set of data for z,P,Pvj and need to find nL using an iteration calculation, how do you setup the summation? Do you add all your z values, all your P values, and all your Pv values then begin the iteration process? Or do you run the calculation separate times?

Does this make sense?

Nov 18th, 2015

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Nov 18th, 2015
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Nov 18th, 2015
Oct 22nd, 2017
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