We use Students t distribution To compare the Z distribution with the t

We use students t distribution to compare the z

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to estimate the confidence interval. We use Student’s t distribution. To compare the Z distribution with the t distribution, it can be noted that when n becomes larger, the t distribution approaches the Z distribution. The common practice is that we can use Z instead of t when n is greater than 120. Properties of the t -Distribution Mean = 0 Mound-shaped Symmetric When n bec omes larger, t becomes closer to Normal Distribution
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