the types of experimental design

an investigation looking for a cause-and-effect relationship

the IV is the variable being manipulated

the DV is the variable measured and is expected to cause change in the IV

when testing the attention span of students in the morning vs the afternoon, whether the students ate or exercised are examples of...

the absence of the experimental variable

the levels of the IV being compared

a different group of parpts is used for each level of the IV

each parpt performs in every level of the IV

parpts are arranged into pairs that are similar in ways that are important to the experiment

these can cause parpts to try and change their behaviour based on their beliefs of what the outcome should be

____________ of parpts to different conditions spreads possible differences between individuals across the levels of the IV

order effects are

fatigue effect is where parpt's performance improves from familiarity

practice effect is where parpt's performance declines due to boredom

counterbalancing is used to overcome order effects in a repeated measures design

keeping the procedure the same for each parpt to ensure any differences are due to the variables being investigated

________ is the extent to which a procedure, task, or measure is consistent

VS

________ which is the extent to which the researcher is testing what they claim to be testing