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T and Z Statistics and Pooling

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Please help with the following problem.

A) When does the t-statistic approximate the z-statistic? Please ask yourself this question before answering: for a probability level of 0.975 on a one-tailed probability distribution, what is z-score and what is t-statistic? Then ask yourself, when does the t-statistic approximates the z-statistic?

B) What does "pooling" standard deviations or pooling sample proportions mean?

C) What do we mean by dependent and independent samples?

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Solution Summary

The approximation of the t-statistics and z-statistics are discussed. The concept of "pooling" standard deviations is also explained.

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t and z statistics, pooling, indie pooling, etc
A) When does the t-statistic approximate the z-statistic? Please ask yourself this question before answering: for a probability level of 0.975 on a one-tailed probability distribution, what is z-score and what is t-statistic? Then ask yourself, when does the t-statistic approximates ...

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