PSY201H1 Lecture Notes - Lecture 3: Normal Distribution, Standard Deviation, Statistical Inference
Document Summary
Lecture 3 the normal curve and standard scores. Developed to explore the process of reading. Psychologists noticed that people named the colour of words faster if the colour names and colour of the letters were the same. People were slower if the colour of the letters was different from the colour name. Incongruent trial: colours do not match the words. Interference = incongruent reaction time congruent reaction time. Range: max-min: =min(____ - ____, =max(____ - ____, =(amax amin) for range. Variances: s2 = [sum of x2 ((sum of x)2/n)]/n 1: =var. s(___ - ___) Standard deviation (square root of variances: =standard deviation (select variances) If a score is changed the mean will always change because every score is used in its calculation, therefore . Very sensitive to extreme scores: many scores around the same value plus one extreme score will greatly change the average to an inaccurate extent, for this reason, median is better for extreme scores as it won"t change.
