Hypothesis Testing - Methods

notes on hypothesis testing for methods

a2 psychology with aqa

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  • Created on: 29-06-12 13:39
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Hypothesis Testing
When we decide to investigate something, the first thing we do is formulate a hypothesis
A hypothesis is a testable statement which is a prediction about the relationship or
connection between two variables
Hypothesis testing is central to any scientific investigation
One and two hypotheses
One-tailed test: a hypothesis that predicts a difference/correlation and stating its direction, e.g.
children score significantly higher in a numeracy test in the morning than in the afternoon
Two-tailed test: a hypothesis that predicts a difference/correlation but not its direction, e.g. there
will be a significant difference in children's scores in a numeracy test between the morning and the
afternoon
Examples of one and two tailed hypotheses in remembering and forgetting studies:
Jenkins and Dallenbach
o One-tailed: Participants who learn the word list before sleeping will recall
significantly more words that participants who learn the list after waking
o Two-tailed: There will be a significant difference in the number of words recalled
between participants who learn the list before sleeping and those who learn it after
waking
o Null hypothesis: There will be no significant difference in the number of words
recalled between participants who learn the list before sleeping and those who
learn it after waking. Any difference found will be due to chance factors
Godden and Baddeley
o One-tailed: Participants who recall the word list in the same environment as it was
learned will recall significantly more words than participants who recall the list in a
different environment
o Two-tailed: There will be a significant difference in the number of words recalled
between participants who recall the list in the same environment as it was learned
and those who recall it in a different environment
o Null hypothesis: There will be no significant difference in the number of words
recalled between participants who recall the list in the same environment as it was
learned and those who recall it in a different environment. Any difference found will
be due to chance factors

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