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Which measure of central tendency works best when you have an outlier?
The median, as long as you don't want to do any serious statistical testing.
How many children did Mary Magdalene have?
To the best of our knowledge, Mary Magdalene had no children.
If you have a lot of variables that are being used to correlate to several other variables is there a statistical test that will show which variable tends to correlate most with the others?
Yes and it is called "the line of best fit"
What is the best statistical method for choosing an element who has Multiple properties?
The method will depend on what the population comprises. For example, if every element in the population has multiple properties then simply random selection will suffice.
What is the ideal sample size for a given population?
There is no "ideal" sample size for any given population, because polls and other statistical analysis forms depend on many factors, including what the survey is intended to show, who the target audience is, how much statistical error is permitted, and so on. The "Survey System" link, below, offers definitions and a couple of calculators to determine the best sample size for most purposes.
