# Spss Lab 7: T-tests Section 1

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2 c. Usig the results from the same table, Paired Sample Statistics, describe the differeces i the data created by the picture of the spider ad the real spider. d. Lookig at the last table created, is the Paired Sample Test table showig you the results from idepedet-meas or repeated-meas? e. Usig the results from the same table, Paired Sample Test, describe the differeces i the data created by the picture of spider ad the real spider. f. Usig what you have leared, o average, which participats experieced sigificatly greater axiety? Justify your aswer by discussig the t-score ad the chose alpha value. Task 3: Idepedet t-test Costructig a idepedet t-test is very straightforward i SPSS. Usig SpiderBG.sav, access the mai dialogue box by. Go to Aalyze -> Compare Meas -> Idepedet Samples T Test. Oce the dialog box is activated, select the depedet variable from the list (axiety) ad trasfer it to the box labeled Test Variable(s) by usig the arrow. 3. Next select the idepedet variable (group) ad the trasfer it to the box labeled Groupig Variable. 4. Click the butto for Defie Groups 5. Eter 0 for the Group (the picture group) 6. Eter for the Group (the real group) 7. Click Cotiue 8. Click OK 9. Copy your ew tables to your Word documet. Aswer the followig questio i your Word documet: g. What differeces do you otice i your Group Statistics table ad your Paired Sample Statistics (the first table you copied for the lab) table? The secod table cotais the mai test statistics. Oe row is labeled Equal variaces assumed while the other is labeled Equal variaces ot assumed. This has to do with the equal variace assumptio; we oly have to pay attetio to the first row. We wat to compare the results i Sig.(-tailed) colum with the data i the t colum (the t-value). Aswer the followig questio i your Word Documet: h. What ca you ifer about the axiety caused by the pictures ad by real spiders? ~Page ~

3 Spss Lab 7: T-tests Sectio Sometimes our data does ot fit the ormal curve (o-parametric data). I class you were give a hadout about two tests that are alteratives to our idepedet t-test ad hadle oparametric data. Task 4: Your Data For this sectio, you will eed to create your data set with its associated values. The study results that you are eterig are from a eurologist that carried out a experimet to ivestigate the depressat effects of certai recreatioal drugs. She tested 0 clubbers i all: 0 were give a Ecstasy tablet to take o Saturday ight ad 0 were allowed oly to drik alcohol. Levels of depressio were measured usig the Beck Depressio Ivetory (BDI) the day after ad midweek. To create your SPSS data,. Ope SPSS ad create a ew Data file.. Save the file as lab7.sav 3. Add your variables: Name Label Drug Type of Drug subdi Beck Depressio Ivetory (Su) wedbdi Beck Depressio Ivetory (Wed) 4. Ad your associated values: Drug subdi wedbdi Ecstasy 5 8 Ecstasy Ecstasy 6 35 Ecstasy 8 4 Ecstasy 9 39 Ecstasy 7 3 Ecstasy 7 7 Ecstasy 6 9 Ecstasy 3 36 Ecstasy 0 35 Alcohol 6 5 Alcohol 5 6 Alcohol 0 30 Alcohol 5 8 Alcohol 6 9 Alcohol 3 7 Alcohol 4 6 Alcohol 9 7 Alcohol 8 3 Alcohol 8 0 ~Page 3~

6 v. Is there a sigificat differece betwee the groups o Wedesday ad/or Suday? Task 8: Sigificace usig the Ma-Whitey test This test is basically the same to with Wilcoxo rak-sum test, but your sigificace formulas will be reduced to oe. Give is the sample size of group (Alcohol) ad is the sample size of group (Ecstasy) R = the sum of raks for Ecstasy data for the give day R = the sum of raks for Alcohol data for the give day Test statistic for the Alcohol data: Test statistic for the Ecstasy data: + + ( + ) R + R ( ) Aswer the followig questios i your Word documet: w. What is the value for the test statistic for the Suday Ecstasy data? x. What is the value for the test statistic for the Suday Alcohol data? y. Usig the Ma-Whitey U table (Appedix B.9A i your text), what is your critical value whe p<0.05 for a two-tailed test? z. Is there a sigificat differece betwee the Ecstasy ad Alcohol groups o Suday? aa. Repeat the above aalysis (w through z) for Wedesday. Task 9: Ma-Whitey U-test & Wilcoxo siged-raks test Now let s have SPSS do the work for us.. Ope your lab7.sav. Click o Aalyze -> Noparametric Tests -> Idepedet Samples 3. Add subdi ad wedbdi to the box labeled Test Variable List by highlightig the variable ad clickig the arrow. 4. Select drug as the idepedet variable by highlightig it ad clickig the appropriate arrow to move it to the box labeled Groupig Variable. 5. Click o the Defie Groups butto SPSS eeds to kow what umeric codes you assiged to your two groups. We coded the Ecstasy group as (so put a i group ) ad the Alcohol group as (so put a i group ). 6. Click Cotiue 7. Uder Test Type, you should have a check mark ext to Ma-Whitey U 8. Click OK ~Page 6~

7 Copy your two charts from your output widow to your Word documet. Aswer the followig questios i your Word documet: bb. Lookig at the charts you copied, do your results from task 7 & 8 match (if ot they should)? cc. How ca you determie if there was a sigificat differece based o the charts aloe? Task 0: Wrap-up Prit out Lab7.doc ad sig the hoor code. Tur i your electroic versio of Lab7.doc via blackboard ad the paper copy to Laura by the ed of the lab sessio. ~Page 7~

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