Why we subtract the value of a(alfa)/2 from 1?In Z(a/2) and what is the purpose of reliability factor?

Hi Ritik, The reason is because the z-table is provided in this way. As you will see a couple of lectures later, the T-table is provided in a different way. Moreover, later on we will exclusively use p-values to find these values. Regarding the reliability factor - it is a main ingredient in the calculation of confidence intervals. It helps us determine exactly how wide the CI will be. Best,Iliya

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Ritik Kumar

Last answered:

April 06, 2020

Posted on:

April 06, 2020

Related to z score and confidence interval

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Iliya Valchanov

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April 06, 2020

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