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Why "T"

Why "T"

Q The t-distribution was introduced in Chapter 5 but a more detailed explanation of the distribution is given in this section. Explain in your own words why we use the t distribution rather than the z distribution (normal distribution) when computing statistical tests on the mean?

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Like a standard normal distribution (or z-distribution), the t-distribution has a mean of zero. ... The t-distribution is most useful for small sample sizes, when the population standard deviation is not known, or both. As the sample size increases, the t-distribution becomes more similar to a normal distribution.