SCI1020 Lecture 10: Part 4b Inference about the difference between two independent population means
22 Dec 2018
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Part 4: inference about the difference between two independent population means. Comparing the same quantitative response variable (as means): To two treatment levels of a single variable on a single population, or. The same variable measured on samples of two populations. A separate random sample from each treatment or each population. Individuals in each sample are not paired/matched, and so the samples can be differing. We have two independent random samples, from two distinct populations or treatm. That is, one sample has no influence on the other-- matching violates independence. We measure the same variable for both samples. The means and standard deviation of the populations are unknown in practice, it is enough that the distributions have similar shapes and that the data hav. Except in the case of small samples, the assumption that each sample is an independen the population of interest is more important than the assumption that the two populati.
