PSY 303 Lecture Notes - Lecture 7: Psych, The Smell, Demand Characteristics
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The iv may have caused participants to leave remaining groups are no longer equivalent when dv is measured. Ex: effects of stress on intellectual intelligence. It is so stressful that most of parti(cid:272)ipa(cid:374)ts lea(cid:448)e a(cid:374)d do(cid:374)"t fi(cid:374)ish stud(cid:455). Ha(cid:448)e 20 e (cid:448)s 40 c. people (cid:449)ho stu(cid:272)k around are probably different than people who left (can handle more stress for example) If have unequal number of participants, could lead to problems. Ex: easy task has 5b tasks, difficult task has 500 items different dvs for different conditions. History real world events that occur outside of the research setting . History may sensitize some participants to manipulation or may impact participants in a control condition. Ex: 303 students last quarter who did candidate opinion. The particular suckiness of these candidates influenced them. Ex: doing research on shooting and there was recently a shooting will have an effect on them. May be general changes in people across time.
