PS101 Lecture Notes - Lecture 4: Normal Distribution, Milgram Experiment, Selection Bias
Document Summary
Selection bias (cure: random sampling- anyone at any time/ random assignment- specific group) What is unethical here: the milgram study. Teacher must give the subject the choice to leave before shocking them again. Descriptive statistics: used to give basic information about what we find, provides a summary, uses statistics such as the mean, the standard deviation, the range known as measures of central tendency. Not everyone gets the same score: expect a distribution, normal distribution, measure variability, variability gives how much a variability a score has from the mean (average) Little variability all bunched up close to the mean. Lots of variability wide curve: standard deviation is an index score based on the distribution. Tells where, in relation to the general plot of scores, the score falls. Involves measuring and determining the relation between two variables: co-relation relation of two things, ex. Kinds of correlation positive and negative: positive correlation as one variable goes up the other does too.
