mktg 415 exam 2

main effect

when the levels of a factor significantly influence a depends variable

demonstrating causation

• Concomitant Variation: A statistical relationship between variables • Appropriate Time Order of Occurrence: Change in an independent variable occurred before an observed change ina dependent variable • Elimination of other possible causal factors: "If you eliminate the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes. Hard to prove something else did not cause a change in B.

lab experiment example

angelic baby + violent v = aggressive baby

experimental validity

internal and external

experiment types

laboratory and field

interaction effect

the levels of one factor influence the deponent variable differently depending on the levels of a second factor

what is casual research?

Research designed to determine whether a change in one variable likelycaused an observed change in another A causal relationship must demonstrate three things: • Concomitant variation (correlation) • Appropriate time order of occurrence • Elimination of other possible causal factors