Statistical Sciences 2035 Study Guide - Quiz Guide: Standard Deviation, Null Hypothesis, Statistical Significance
7 Oct 2018
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This indicates the number of values free to vary in a set of values. As sample size increases probability approaches the normal distribution and degrees of freedom have little impact, but they do when sample sizes are small and have the effect of increasing the probability level needed to achieve significance. This changes the cut-off points regarding the significance level: (a. ) Statistical tests for 2 independent groups (between-subjects design) comparing 2 samples. The aim of these types of testing is to determine whether two groups differ significantly or not. One is that both groups are samples from the same population and their means only differ by chance sampling variations (i. e. not statistically significantly maintain null hypothesis). The other is that their means do differ statistically significantly and are likely from different statistical populations: If there are small differences between the means, small samples and large.
