Stats Notes Essay

5010 words - 20 pages

Lesson 7One sample to population T testsOne-Sample Significant Difference TestsA great deal of inferential statistics is about using procedures to help us infer that a difference does or does not exist between two situations. Knowing whether two things are different allows us to make reliable, valid decisions about that information. How different does a result need to be before we can call it significant (or important)? Another way to ask this question is to ask "how great must the difference between two groups be before we can conclude that the difference is reliable and real, and not just a fluke of the specific samples we have examined?" For example, you know that a mean score of 10 is different from a mean score of 11. But in certain situations these values might be so close to one another that for all intents and purposes, we can act as though they are the same value. The question is then, what is a big enough difference that will allow us to act as though the two values are in fact different? The answer to this question depends on several factors. For a finding to be statistically significant (big enough), it must be reliable and replicable (repeatable) - you must be able to find it again using the same techniques with a different sample. In order to decide that a result is replicable (and can be generalized to the population) we must use procedures called significance tests.When you find a "statistically significant difference," this does not mean that you have found "proof" of something. Proof is for courts - in statistics, we say we have supporting evidence for a hypothesis. Also, finding a statistically significant difference may not be of practical use - for example, you may find a statistically significant difference between men and women in their math scores but this is of little use in selection for a job or for choosing candidates for a training program because the difference may be in the means but is too small to be applied to individuals. We would say this difference is not "practically significant" even though it was found to be statistically (mathematically) significant.A significance test is basically a procedure. Part of the procedure is plugging numbers into a formula. The result is a single number that can tell you whether the difference you have observed is probably different enough to be considered reliable and not due to chance.There are many different types of tests that you might use, depending on the type of data that you are using, the number of groups that you are comparing, and the relationship you are attempting to explore. If data are collected using interval/ratio scales, then the tests that you use will are called parametric tests. If the data is nominal or ordinal, you use nonparametric tests. Parametric tests are based on a) data parameters, b) data that are assumed to be normally distributed, and c) the assumption that the standard deviations of the samples being compared are very similar. Nonparametric...

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