Answer for Why do we calculate z(1 -alfa/2) instead of z(1-alfa) if the z-table corresponds to z(1-alfa) and not z(1-alfa/2)

https://365datascience.com/dwqa-answer/answer-for-why-do-we-calculate-z1-alfa-2-instead-of-z1-alfa-if-the-z-table-corresponds-to-z1-alfa-and-not-z1-alfa-2/ -

Hi there,

This depends on whether you need the probability on both sides or just one side of the mean.

In the case of confidence intervals, this is always on both sides.

Please check the z-table here: https://www.dropbox.com/s/j1iuhz7rrnw8ks7/3.9.The-z-table.xlsx?dl=0 

Example 1 is the one you are looking for!

Best,

Iliya

#365datascience #DataScience #data #science #365datascience #BigData #tutorial #infographic #career #salary #education #howto #scientist #engineer #course #engineer #MachineLearning #machine #learning #certificate #udemy