From the course: Statistics Foundations 4: Advanced Topics
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T-score tables and degrees of freedom
From the course: Statistics Foundations 4: Advanced Topics
T-score tables and degrees of freedom
- Z-scores are based on the standard deviation of the entire population, but, if we have a small sample size and we don't have access to the population's standard deviation, we can't use the z-score. Instead, we need to utilize t-distribution charts. Yes, you heard me right. There is not one single t-distribution chart, but rather multiple charts. From the previous video, you hopefully remember the curves associated with t-distributions are dependent on the sample size. The smaller the sample size, the flatter the distribution curve. The larger the sample size, the closer the curve gets to the normal distribution. That's why for each sample size, we need a different t-score distribution table. Just in case you forgot, here's a snapshot of just one part of the z-score table. So imagine having a different table for each unique sample size. Yeah, that would be a lot of really big tables, but let's face it. Most of…
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