PSYC 218 Lecture Notes - Lecture 2: Educational Psychology, Statistical Inference, Continuous Or Discrete Variable
Document Summary
There is an appendix with a review of mathematical content. X [or y] stand for variables (here x stands for age) Subscripts on x stand for specific observations. N stands for number of subjects or scores (here n=5) Xi stands for i-th score, where i can very from 1 to n. = summation sign add up whatever comes after it. [add up all the scores that follow it] Xi = summation equation sum of the x variable from i=1 to i=n. i=1. Short form of the summation equation (look at paper) when summing over. 2+etc) would be 32+42+62+42+52 = 102 ( sum x squared : x2 (= x1. 2. ( x)2 (= x1+x2+x3+ etc) would be (3+4+6+4+5)2 = 484 ( sum x quantity squared ) The type of scale used to collect data can influence type of statistical inference test used to analyze data. Equal intervals between adjacent units, inherent direction/order, no absolute zero.
