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Errata

Statistical Methods for Psychology,
5th ed.

David C. Howell


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This is an ongoing listing of errors in the 5th edition. I will give credit to those who point out errors when I can. When I don't know the name of the person who pointed out the error, I am still grateful even if I can't give credit.

Because of the way I expect to distribute this list, I cannot be sure that subscripts and Greek symbols will come across. Subscripts are usually shown in parentheses [as in s(1)], superscripts as s^2, and Greek letters are spelled out.
 
 

The Text

Page Line Correction
Frontpages   This book is dedicated to my wife, Donna. I forgot to do that in the first printing, and feel really bad.
67 Prob 2.20 Jaime Adcock pointed out that in part b the ")" should come after the superscript 2, not before it.
89 Ex 3.19 Tim Weston pointed out that a much better answer than the one I gave would be " that the T-scores do not have an exact mean of 50 and a SD of 10 because of random sampling error." I gave a correct answer to a question that is no longer there.
90 Ex 3.22 The sat.dat file on the CD is in error. You can get the correct file by going to http://www.uvm.edu/~dhowell/StatPages/Methods/DataMethods5/
164 Table 6.5 Gary Stockdale (UC Davis) pointed out that unless society has changed far more than any of us think, the labels on the rows should be reversed. I say it correctly in the text.
224 Line 33 Albert Smith, at Cleveland State, made a interesting point that power is the probability of rejecting the null when a particular alternative hypothesis is true. Power can only be defined relative to some set of parameters, hence the reference to an alternative hypothesis.
252 Footnote The data are actually on your disk in Tab9-2.dat. Billy Bowen at the Univ. of Southern Miss. pointed this out to me.
254 Example of radj The formula should contain (1-.5062) instead of 1-.506)2. Thanks to Pekka Rapeli.
266 first equation The formula should read [SSY - SSresidual]/SSY Thanks to Dale Berger.
266 Line 3 It should read 1-r2 instead of r2. Thanks to Albert Smith.
277 second from bottom The word "slopes" should be changed to "correlations." Thanks to Albert Smith.
308 Middle Strike the parenthetical sentence that says "(Lines are not drawn when two judges give an object the same rank.) I don't know why I said that--if those lines don't cross other lines, it doesn't hurt to have them, and if they do you need to have them. Thanks to Mike Clark at the Univ. of North Texas.
341 Line 15 Change to "weaker of the two."
342 Equation for df The term in the denominator that is squared should be . Thanks to Dan Denis at York University and Ric Luecht at UNC-Greensboro.
355 Middle For two groups f' would be equal to d/2, not to d as stated there. Thanks to James Alexander, at the University of Tasmania.
399 5th from bottom Change "too large" to "too slowly." Also change last formula to alpha(sub r) = alpha/(k/r) = r*alpha/k.
413 3rd equation The denominator should not contain a square root. Thanks to Aaron Shurger at Princeton.
413 Top last full paragraph There are 25 df for error, and the critical value of F is 4.245. Thanks to Dale Berger.
417 Exercise 12.19 I made an error in the answer I gave to this question. I gave one from an earlier edition to referred to data that are no longer there. J. C. Pienaar at  the University of Natal, Pietermaritzburg, South Africa pointed this out. The correct answer can be found at Correction for Exercise 12-19.
426 Table 13.2 Larry Cross pointed out that I messed up the calculations for the main effects. The formulae are correct, the answers are correct, and the (10)(5) and (10)(2) are correct. But everything within square brackets [] goes with the other calculation. Karl Wuensch pointed out that for SSC, the mean for younger folks should be 13.16.
450 Line 4 Change reference to Chapter 16, not 15.
431 Figure 13.4 The points in that figure are not plotted exactly, but the overall impression is correct.
458 Table 13.12 The data are correct as given, but the SPSS data file, and some of the others that come on the CD, list the variables as C, B, A when they should have been listed as A, B, C. Thanks to Vamsi Koneru at the Univ. of Miami.
463 Last eq. in part (a) SSAB at C1 should be SSCells AB at C1... instead of SSCells BC at C1. Thanks to Vamsi Koneru at the Univ. of Miami.
468 Ex13.21 This problem is right, but the answer in the back is wrong. That answer was based on a previous question that gave cell totals, rather than cell means. Multiply every SS and MS by 25 and you will come out right. Dan Denis caught this one. 
477 9 lines from end Change SStotal to SSerror.
521 15 lines from end Insert "for each difference score" after "to be 0.0."
527 Ex14.7 The Between Groups covariance matrix that I give in the complete solution is wrong. (It was based on totals rather than means.) The correct matrix should be
0.18 0.36 1.38
0.36 0.72 2.76
1.38 2.76 10.58

Thanks to Marty Giesen at Mississippi State.

548 Line 9 R should be R2. Thanks to Dale Berger.
567 Line 5 Gary Stockdale pointed out that what I wrote was incorrect.  Andreas Klier has suggested that I mean r0(i.1) instead of r0(1.i) . He is correct, and I think that explains Gary's concern.
574-577   I made a major error here, and I cannot, in good conscience, pretend that it was a typo. I treat the path labeled "b" as if it were the simple direct path from the mediator to the dependent variable. In reality, "b" should be the coefficient from the mediator to the dependent variable after controlling for the independent variable. In other words its value is .323, and its standard error = .323/3.041 = .106. The conclusion are unaffected.A revised  Section 15.13 can be found as a pdf file at MedModCorrection.pdf.  Thanks to Karl Wuensch.
582 Line 7 Martin Le Voi pointed out that it should read "csupport = -15" instead of "csupport = 15."
588 2nd full para. Niko Tiliopoulos, at the Univ. of Edinburgh, pointed out an error that resulted from another error. For these data Outome is actually coded 1 = better, 2 = worse. Therefore my description of the direction of prediction is backward. It is trying to predict the higher level of outcome.
611 First matrix The column heading AA(11) should read AB(11). Thanks to Jerwen Jou
613 Matrix Upper right entry should be 0.00 insteadof 1.00. Thanks again to Jerwen Jou.
651 Ex 16.9 Reference should be to Table 16.2, not 6.13. Thanks to Christianne Hawken at Dalhousie.
696 Line 2 Change to "She had reason to doubt ..."
698 Line 13 This should read 99.97% instead of 99.93%. thanks to Karl Wuensch.
703 Fig. 18.6 First there are two typos-->4 should read >= 4, and 397 should read 379. Second, Karl asked why I say 277 <= 4 when 379 + 31 = 410. Apparently it is because of rounding. A 3.5 would be recorded as 4, but is not >= 4. (I didn't write the program.) Ignore "G = 0.5".
765 Cohen(1960) Dan Denis pointed out that the volume for this reference is actually vol. 20 rather than vol. 10.
775 Ex3.19 Replace answer with "The mean and standard deviation deviate from what we expect due to sampling error."
776 Ex6.13  I should have said the odds of  voting for civil unions are 2.66 times as high in women.
776 Ex6.27 Two errors. First, men are more likely to be the primary shopper (at least that's how the data are phrased). Second, it should read the odds of being the primary shopper are 14.06 times higher for men than women. Thanks to Christopher Green at York.
784 Ex13-11 See note about page 468. Multiply all SS and MS by 25.

 

Data Sets


There is a major problem with the data sets. I don't know who to blame, but it really doesn't matter. The data as found on the CD does not go beyond Chapter 13. I cannot supply complete SPSS, Minitab, etc. data sets, but I can certainly supply the data in ASCII form, which you can read into whatever program you have. There is a self-extracting archive of all of the data found in DataAll.exe. Simply click on this link and tell the resulting dialog box where you want to store the download--the desktop is fine. After the file is downloaded, click on the downloaded file and indicate where you want the data files to be stored. Because this is a self-extracting archive, you do not need archiving software to open the file. Once the data are extracted, you can safely delete the archive file itself.
 
 

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Last revised: 01/28/05