Answer for Related to z score and confidence interval

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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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