put the value of (card field one/card field two) into card field four
put the value of 1.96 * sqrt(((card field four) * (1-card field four)) / card field two) into bag
put the value of card field four - bag into card field three
put the value of card field four + bag into card field five
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Simply enter the number of individuals in your sample along with the number displaying a desired phenotype. Click on the calculate button and you will get the confidence limits for your value which is the numerical span between which the true mean of your sample falls with a better than 95% accuracy.