It is often useful to begin one’s examination of a set of data by looking at the distribution of scores
I feel like the author is talking about datasets in general. Scores? Does every entry in a dataset have a score? No, let’s just say these datasets have something called a score for each record and the score is numeric.
central tendency
I recall this. I’m a little rusty.
median … defined as the minimal score having at least 50% of the scores less than or equal to it.
Yi to denote the score of the ith individual on the dependent variable
Ybar sample mean
sample distribution … population distribution
Characteristics of samples are termed statistics, whereas characteristics of populations are called parameters.
Pretty sure I never knew that.
We will follow the convention of using Greek letters to denote population parameters and Roman letters to denote sample statistics.
Very clear! I feel like maybe this was always going on and I never noticed. lol
the expected value of Y is the sum of all values in the set times the probability of each.
Start here next pomo.
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