Health Sciences 2801A/B Lecture Notes - Lecture 3: Standard Deviation, Memory Span, Metacarpal Bones
30 Nov 2017
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Scores: observed score, centred scores, standardized scores (z score, t score, deviation score) Variables: sum of squares, variance, standard deviation, normal distribution, skewed distribution. Relationship between variable: sum of products, simple correlation. Observed score: an observed score is a number yielded by a measurement instrument. Centred score: a centred score is calculated by subtracting the mean from an observed score (ex. It is calculated by summing the squared centred scores. It is equal to zero when all the scores are the same (no variability) It is the average amount that scores differ. It is the useful one but we need the other steps to get here. Degrees of freedom: a variance has degrees of freedom of (n-1) because centred scores always sum to zero. Standardized scores: standardized scores are centred scores that have been scaled in terms of the standard deviation, a common standardized score is a z score.
