PSYC 1010 Study Guide - Final Guide: Standard Deviation, Unimodality, Descriptive Statistics
29 Jun 2018
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1010 exam chapter 4
Central tendency
•refers to the descriptive statistic that best represents the centre of data set, the particular
value that the other data seems to by gathering around
•Mean: group of scores average
•Mean of a sample: M or x̄
•Statistics (M), the numbers based on samples taken from population
•Mean of a population: μ
•Parameter (μ), the numbers based on whole population
•Medium: best for a skewed distribution
•Mode: most common interval
•Unimodal: when a distribution of score has one mode
•Bimodal: two modes
•Multimodal: more than 2 modes
•Range: a measure of variability calculated by subtracting the lost score from the highest
score
Variance
•The average of the squared deviation from the mean
•calculation,
•Deviation fro the mean: amount that a score in a sample differs fro the mean of the sample
•Sum of a square (ss): the sum of each score;s squared deviation fro the mean
•SD and S = standard deviation square
Standard deviation
•Useful because it is the typical amount that each score varies form the mean
•Is the square root of the average of the soared deviation from the mean
•Calculation,
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