Psychology 210: Analysis of Variance Review Closed Book Review comparng more tha

Question

Psychology 210: Analysis of Variance Review Closed Book Review comparng more than two treatment means, why should you use an analysis of variance , nstead of using several t tests? What is an experiment wise alpha leve beocnre Pli 2In general, what does the F-ratio consist of for both types of research designs? con redf- 3. In a between subjects analysis of variance, differences betwe nts contribute to which renif 4. MS is the notation for teammate, di'" ( v . 5. If all three treatments have the same mean, which source of variance woukd be equal to 6. On average, what vakue is expected for the F-ratio if the mull hypothesis is true? 7. What is the purpose for post hoc tests? nn .ne neCASNT Fr Sien pn 8. A researcher reports an F-ratio with df-2, 18 from an independent-measures research study. Based on tihe df vabes, how mry treatments were compared in the stud, and what as the total mamber subjects participating in the study? a. 2 treatments and 19 subjects b. 2 treatments and 20 subjects 3 treatments and 21 subjects d. 3 treatments and 22 subjects 9. How would you describe the shape of the distribution of F-ratios? ie Skeue e -10. The following table shows the results of an analysis of varance comparing thre treatments. Whar is the value of ?2, the percentage of variace accounted fr.for these data? Between 30 2 15 F-7.50 Within 60 30 2 C. d. 60/90=.67 2/30=.067 Total 90 32 11. If an analysis of variance is used for the following data, what would be the eflect of changing the value of SSI to 50? a. Increase SSwithin and increase the size of the F-ratio Mi -10 M2-20 55 b. Increase SSwathin and decrease the size of the F-ratio SS1-90 SS2-70 c. Decrease SSwithin and increase the size of the F-ratio d. Decrease SSwithin and decrease the size of the F-ratio 9. In an independent-measures ANOVA, individual differences contribute to the variance in the numerator and in the denominator of the F-ratio. For a repeated-measures ANOVA, what happens to the individual differences n the numerator of the F-ratio? caut 6,.., Pes,e 10. In a repeated-measures analysis of variance, how does the magnitude of the mean differences fom one treatment to another contribute to the F-ratio? a. The mean differences add to the numerator of the F-ratio b. The mean differences add to the denominator of the F-ratio. c. The mean differences add to both the numerator and the denominator of the F- sample mean differences do not influence the F-ratio. serer?+-test ca mle? sever ?nflipant..tte..e ei.r. m).ctiej

Explanation / Answer

Solution5:

take three samples

Between groups variance is zero

Solution10:

comapre these ANOVA tables

decrease SSwithin and increse the szie of F ratio

a b c 12 18 18 12 18 18 27 18 27 21 18 9

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