Statistical Methods for Psychology

THEANALYSIS OF VARIANCE(ANOVA)has long enjoyed the status of being the most used (some would say abused) statistical technique i ...

the material (the way most of us read a newspaper or, heaven forbid, a class assignment), then the five groups should have shown ...

Now let’s move from our physical model of height to one that more directly underlies our example. We will look at this model in ...

As we will see later, under certain conditions the assumption of homogeneity of variance can be relaxed without substantially da ...

variance of the population from which the scores were drawn. Because we have assumed that all populations have the same variance ...

estimates agree, we have no reason to reject. If they disagree sufficiently, we conclude that underlying treatment differences m ...

11.4 Calculations in the Analysis of Variance At this point we will use the example from Eysenck to illustrate the calculations ...

groups—the data were actually drawn from a normally distributed population. With real data, however, it is important to examine ...

SStotal The SStotal(read “sum of squares total”) represents the sum of squares of all the observa- tions, regardless of which tr ...

When we sum these individual terms, we obtain 435.30, which agrees with the answer we obtained in Table 11.3. The Summary Table ...

estimate of the population variance ( ), regardless of the truth or falsity of , and is actually the average of the variances wi ...

Conclusions On the basis of a significant value of F, we have rejected the null hypothesis that the treat- ment means in the pop ...

the poor recall to be expected from passive studying. Good recall, whether it be lists of words or of complex statistical concep ...

Section 11.6 Computer Solutions 331 Estimated Marginal Means of RECALL Group Counting Rhyming Adjective Imagery Intentional Esti ...

The output here looks like what we computed. You would get the same general results if you had selected Analyze/General Linear M ...

=3910.742 SSerror=SStotal 2 SStreat=4525.386 2 614.644 =614.644 = 26 (-0.45 2 2.76)^2129 (3.01 2 2.76)^21 (17 * (7.26 2 2.76)^ ...

334 Chapter 11 Simple Analysis of Variance Control CogBeav Treatment Family –10 0 10 20 Weight Gain Figure 11.3 Weight gain in E ...

In Chapter 7 we considered the Levene (1960) test for heterogeneity of variance, and I mentioned a similar test by O’Brien (1981 ...

Define Then This statistic ( ) is approximately distributed as Fon k– 1 and degrees of freedom, where Obviously these formulae a ...

the transformed values. We did something similar in Chapter 9 with the Symptom score in the study of stress. Most people find it ...