PSY 111 1st Edition Lecture 5 Experimental correlation method Designed to study relationships Used to establish the degree of relationships correlation between two characteristics events of behaviors Positive correlation negative correlation zero correlation no relationship o The negative and positive describes the direction of the relationship Correlation coefficient a numerical value that indicates the strength and direction of the relationship between two variables ranges from 1 to 1 1 strong 5 weak 0 weak 5 strong 1 negative corr Positive corr Technically 0 is the lowest correlation you can have since its no correlation Correlation vs causation o Correlation does not imply causation o Correlation is an indicator of relationship but not predictive Experimental research o Only research method identify cause and effect relationships o It is designed to test a hypothesis a prediction about about a cause and effect relationship between 2 or more variable o You star off with a why question 2 kinds of a hypothesis o experimental the treatment or manipulation causes an effect o Null the treat or manipulation does not causes an effect o Why would we have a null hypothesis For comparison To show that the null hypothesis of being true are so low that you confident your treatment works must remain skeptical to remove bias Variables in experiments o Independent variable IV factor or condition that is manipulated by the experimenter the treatment o Dependent variable DV factor condition that is measure at the end of the experiment varies as a result of the independent variable You must account for other variable that effect the DV this is called the o Confounding variables factors conditions other than independent variable that could cause an effect on the dependent variable 3 kinds of confounding variables selections bias occurs when there are differences between groups that influence results outside the influence of the IV continued by random assignment placebo effects participants belief about the effect of the treatment influences results outside the effect of the IV controlled by blind research design experimenter bias experimenter s belief about the results impacts the results outside of the influence of the IV hardest to control controlled by the double blind research design
View Full Document
Unlocking...