Psychological Statistics

# Psychological Statistics - Psychological Statistics...

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Psychological Statistics - Psychology is a quantitative endeavor. - Operationalism demands that we specify the means of measurement of concepts we study. - Psychological statistics come in two varieties: o Differential Statistics o Inferential Statistics Raw Data - Untreated data – exactly in the form originally measured; no summary, analysis, or interpretation. - For Example: Psychologist conducts an experiment on learning with a sample of 40 rats. Each rat is run through a complex maze with many turns and the number of incorrect turns (errors) is recorded. Each rat is run repeatedly through the maze until “mastery” is attained (defined operationally as 3 consecutive trials without an error). o Important Data: Number of Trials to Mastery Descriptive Statistics - Statistics that describe or summarize collections of data. - Description can be tabular (table), pictorial (graph), or might involve the computation of an index (e.g., the mean). Measures of Central Tendency - Measures of central tendency provide us with an index of where the center of the distribution is located. - Mean (capital X with a bar over it) – The Arithmetic average o MeanX = ΣX / N o Mean = All Scores Added / Total Number of Scores - Median – A point in the distribution at which exactly half of the scores are higher and exactly half are lower. o If the distribution has an odd number of scores, arrange them in ascending order and simply select the middle score. o If the distribution has an even number of scores, arrange them in ascending order and take the average of the middle two. o

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## This note was uploaded on 04/09/2008 for the course PSYC 1101 taught by Professor Hovancik during the Fall '07 term at Seton Hall.

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Psychological Statistics - Psychological Statistics...

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