MEMORY PERSPECTIVES: DATA ANALYSIS Week 9 Practical

SAMPLING DISTRIBUTIONS MEMORY PERSPECTIVES WEEK 8 PRACTICAL LECTURE 1 PRACTICAL WEEK 1 NO LECTURE NO PRACTICAL WEEK 2 NONPARAMETRICS 1 1ST PRACTICAL WEEK 3 NONPARAMETRICS 2 1ST ANALYSIS WEEK 4 1ST ANALYSIS (BY HAND) WEEK 5 SAMPLING DISTRIBUTIONS 2ND PRACTICAL WEEK 6 HYPOTHESIS TESTING 2ND ANALYSIS WEEK 7 RELATED T-TEST 2ND ANALYSIS (BY HAND) WEEK 8 INDEPENDENT T-TEST 3RD PRACTICAL WEEK 9 INDEPENDENT ANOVA 3RD ANALYSIS WEEK 10 DEPENDENT ANOVA

BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: MEMORY PERSPECTIVES LEARNING OUTCOMES BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Use SPSS to test the first hypothesis in the memory perspectives practical and interpret the output. Use SPSS to test the second hypothesis in the memory perspectives practical and interpret the output. Make a start on writing up your RESULTS and DISCUSSION sections for your lab report.

The first 2 columns show subject id and group membership. MEMORY PERSPECTIVES RESULTS The first 2 columns show subject id and group membership. The last two columns show recall for LIST A (BURGLAR) and LIST B (BUYER). (Perspect 0 = BURGLAR; Perspect 1 = BUYER)

INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test MEMORY PERSPECTIVES RESULTS Q1: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST A (burglar relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test In SPSS, Independent t-test may be found under analysis > compare means > independent-samples t test.

INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test MEMORY PERSPECTIVES RESULTS Q1: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST A (burglar relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test SPSS would like to know what the test variables (DV) is. At the moment, we’re just interested in LIST A recall. We also need to define our ‘grouping variable’ (IV) which is BURGLAR (0) or BUYER (1). We have to tell SPSS that out first group is assigned to the number value 0 and the second group to the number value 1.

Now for the t-test: t(151) = 6.64, p < .001. MEMORY PERSPECTIVES RESULTS Q1: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST A (burglar relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test Levene’s test assesses whether our two groups have homogeneity of variance. If Levene’s is NON-SIGNIFICANT we assume equality. Now for the t-test: t(151) = 6.64, p < .001.

Let’s repeat this exercise for the second hypothesis. MEMORY PERSPECTIVES RESULTS Q2: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST B (home-buyer relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test Let’s repeat this exercise for the second hypothesis. In SPSS, Independent t-test may be found under analysis > compare means > independent-samples t test.

Everything else can stay as is. MEMORY PERSPECTIVES RESULTS Q2: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST B (home-buyer relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test Now, we’re interested in LIST B (buy_fea) recall rather than LIST A (burg_fea) recall, so switch these test variables around. Everything else can stay as is.

And the t-test: t(151) = -3.90, p < .001 MEMORY PERSPECTIVES RESULTS Q2: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST B (home-buyer relevant items)? INTERVAL + BETWEEN Ss + 2 GROUPS Independent t-test Once again, Levene’s test comes through for us, supporting equal variance between the burglars and the buyers. And the t-test: t(151) = -3.90, p < .001

LIST A BURGLARS > BUYERS LIST B BURGLARS < BUYERS MEMORY PERSPECTIVES RESULTS Q1: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST A (burglar relevant items)? LIST A BURGLARS > BUYERS Q2: Do ‘BURGLARS’ and ‘BUYERS’ have different levels of recall for LIST B (home-buyer relevant items)? LIST B BURGLARS < BUYERS What implications do these two hypotheses have for the memory perspectives account?

BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: MEMORY PERSPECTIVES LEARNING OUTCOMES BY THE END OF THE SESSION, YOU SHOULD BE ABLE TO: Use SPSS to test the first hypothesis in the memory perspectives practical and interpret the output. Use SPSS to test the second hypothesis in the memory perspectives practical and interpret the output. Make a start on writing up your RESULTS and DISCUSSION sections for your lab report.

THERE IS NO PRACTICAL SESSION IN WEEK 10 MEMORY PERSPECTIVES THERE IS NO PRACTICAL SESSION IN WEEK 10 CLARIFY ANY OUTSTANDING ISSUES YOU HAVE WITH YOUR TUTORS NOW...

What are the flaws in this study? MEMORY PERSPECTIVES DISCUSSION GET TOGETHER IN GROUPS OF THREE OR FOUR AND REFLECT ON TODAY’S EXPERIENCE USING THE FOLLOWING QUESTIONS What are the flaws in this study? Could I have made one-tailed hypotheses? How would this have changed the p value? What do the inferential statistics NOT tell me about my results?