coincise summary on aims, procedures, results and conclusions on practical investigation of cognitive psychology
including results of Mann Whitney U test and significance level
and evaluation in terms of generalisability, reliability and validity
COGN. PRACTICAL INVESTIGATION
Background:
Baddeley (1966b): acoustically similar perform worse but forgotten less
= words still in STM for semantically similar words lost by the time of retest
Aim: to investigate effect of acoustic similarity on STM
IV: acoustically similar/dissimilar words
DV: n. words recalled from list of 10 in a free-recall memory test
Experimental hypothesis: more acoustically dissimilar-sounding words recalled than
acoustically similar-sounding words
Null: no significant difference in n. Acoustically similar/dissimilar-sounding words recalled
(due to chance)
Independent groups design (test for difference btw diff conditions, ordinal data)
Opportunity sample
P:
1) 20s to learn list of acoustically similar words
Screen blank: 30s to recall list in any order
2) 20s to learn list of acoustically dissimilar words, then 30s recall
R:
Acoustically similar Acoustically dissimilar
Mean 6.2 6.6
Median 6 7
Mode 6,7 7
Range 2 3
SD 0.67 1.02
More acoustically dissimilar words recalled
Mean : 6.6 > 6.2 acoustically similar
SD: 1.02 >0.67 similar = greater spread of results for acoustically dissimilar (some easier to
recall, but others harder to recall )
Mann-Whitney U test:
U = 9.5 > 4 (ct) for 1-tailed test at p<0.05 with N1/2= 5
Result is not significant and null hypothesis accepted
C: Baddeley (1966b) recall of acoustically similar words worse
U = no significant difference in recall
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller erikakumar. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £3.06. You're not tied to anything after your purchase.
