Statistical Methods for Psychology

With 25 df, the difference between the two groups is significant. We now calculate which, with the exception of the arbitrary si ...

population means and standard deviations). Others (Glass [1976] and Hedges [1981]) expressed their statistics ( and g, respectiv ...

subsequent sexual abuse. Both variables have been scored as 0, 1 variables—an individual received instruction, or she did not, a ...

It should be apparent that in calculating and , we have been asking the same ques- tion in two different ways. Not surprisingly, ...

an effect equivalent to a correlation of .32 between presence or absence of psychotherapy and presence or absence of improvement ...

Statistical significance is a good thing, but it certainly isn’t everything. Percentage of vari- ation is an important kind of m ...

Ranking Data Students occasionally experience difficulty in rankinga set of measurement data, and this section is intended to pr ...

are data on the average weekly spending on alcohol and tobacco in 11 regions of Great Britain. (We saw these data in Exercise 9. ...

Kendall defined It is well known that the number of pairs of Nobjects is given by N(N 2 1) 2. For our data Thus, as a measure of ...

was motivated by a question sent to me by Jennifer Mahon at the University of Leicester, England, who has graciously allowed me ...

two measures is .215, which has an associated probability under the null of .016. This correlation is significant, and we can re ...

results for Mahon’s data is shown below. You will see that the Linear-by-Linear Association measure of 5.757 is the same as the ...

Table 10.4 Judge’s rankings of pleasantness of colored patches Colored Patches Judges A B C D E F G H 1 12345678 2 21543876 3 13 ...

Hays (1981) recommends reporting Wbut converting to for interpretation. Indeed, it is hard to disagree with that recommendation, ...

312 Chapter 10 Alternative Correlational Techniques a. Plot these data and fit a regression line. b. Calculate and test it for s ...

Exercises 313 10.11 An investigator is interested in the relationship between alcoholism and a childhood his- tory of attention ...

314 Chapter 10 Alternative Correlational Techniques 10.17 On page 302 I noted that Rosenthal and Rubin showed that an of .1024 a ...

Discussion Questions 10.21 Rosenthal and others (cited earlier) have argued that small effects, as indexed by a small , for exam ...

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CHAPTER 11 Simple Analysis of Variance CHAPTER 11 Simple Analysis of Variance Objectives To introduce the analysis of variance a ...