Errata for Explaining
Psychological Statistics, Second Edition
To determine which printing of the second edition you have, look at the page opposite the dedication page ("For Leona"), which is also the reverse side of the second title page. At the bottom of that page, you will see a sequence of numbers like this: 10 9 8 7 6 5 4; the last number in the sequence is the number of the printing you have (the sequence in this example is for the fourth printing).
If you have printing 5 or 6, please make the changes in the table immediately below. (To avoid having to create subscripts, I have used a notation in which X sub 3 means that X has 3 as a subscript, and X sup 3 means that X has 3 as a superscript). If you have an earlier printing, you should also make these changes and then look for additional errata tables below.
Please send any additional corrections, comments, suggestions, etc., to me at: barry.cohen@nyu.edu.
Page Number 
Line/ Location 
Correction (for all printings of the second edition, up to the 6th printing) 
p. 46 
Table 2.15 
For the single column of numbers under the heading “Stem,” numbers not followed by an asterisk, should be followed by a period. 
p. 67 
Answers to Chap. 3, sec. A 
For #8, the third line should read: "Compared to the values calculated in Exercise 6b..." 
p. 86 
Answers to Chap. 3, sec. C 
For #10b, it should read: "Compare your answer to your answer for part a of Exercise 9." 
p. 116 
In first sentence under “The Central Limit Theorem” 
Insert the term “reallife” so it reads like this: "… and we know that reallife populations do not perfectly follow a normal distribution …” 
p. 119 
Paragraph preceding “Rule 3:…” 
First sentence should read: “Just as two events can be mutually exclusive but not exhaustive (e.g., z > +1.0 and z < 1.0)… “; the second sentence should read: “For example, the two events z > 1.0 and z < +1.0 are exhaustive …” 
p. 157 
Line 16 
Should read: “… (Guinness was afraid that other beer companies …” 
p. 211 
4th line of summary pt. #5 
Change: “(n sub 1 – n sub 2 – 2)” to “(n sub 1 + n sub 2 – 2)” 
p. 226 
Equation in middle of page 
The letter “d” in the second term of the equation should be in boldface, and not italics. 
p. 342 
The line just above “Assumptions of the OneWay ANOVA” 
There should be a slash between the terms T sub T sup 2 and N sub T to indicate that they should be divided, rather than multiplied. 
p. 353 
2nd line below Formula 12.14 
Change “(Formula 12.13)” to “(Formula 12.12)” 
p. 393 
2/3 down page 
Three lines above “New Terminology” the word because is misspelled. 
p. 400 
Fifth line from bottom of page 
Should read: “…because the drug does work much better …” 
p. 413 
Line 5 below “Step 6…” 
Should read: “…F, which is 6.64, is greater than the corresponding critical F, 3.23.” 
p. 422 
2/3 down page 
First sentence of last paragraph should read: “In Figure 14.9 … in the twoway ANOVA (F = 18.3); it is the …” 
p. 432 
Exercise #3 
Should end like this: “… test all of the possible 2 × 2 interaction contrasts, as post hoc comparisons.” [See also change to p. 719.] 
p. 437 
Line 9 
“…Table 15.1 that highlights the use of the (eight) different subjects as levels of a …” 
p. 437 
Second sentence of last full paragraph 
Should read: “You may remember that higher positive correlations meant higher …” 
p. 443 
14th line from bottom of page 
Should read: “… would be analyzed using an RM ANOVA …” 
p. 473 
2/3 down page (just before sentence that begins “Finally,) 
Should read: “ = 18(21.19) = 381.4” 
p. 566 
Formula 18.1 
Should read: “Y = µ + α sub i + e sub ij ” [Changing subscript of alpha from “j” to “i”.] 
p. 605 
Five lines from bottom of page 
Should read: “… in Table 18.15 is not correlated …” 
p. 609 
Formula 18.1 
Should read: “Y = µ + α sub i + e sub ij ” [Changing subscript of alpha from “j” to “i”.] 
p. 711 
Answers to Chap. 2, sec. C 
For #2 and #4, for the single column of numbers under the heading “Stem,” numbers not followed by an asterisk, should be followed by a period. 
p. 719 
Upperright corner (answer to 14C3) 
Answer should begin: “3. F sub S = 2 × 3.17 = 6.34. Then change “F sub crit = 4.125” to “F sub S = 6.34,” for each of the three tests. 
p. 720 
Lowerright corner (answer to 16B3) 
Bottom two lines should begin: “F sub emotion = 12.25/.458” and “F sub inter = 64.0/.458” 
If you have printing number 3 or 4, please make the following five corrections in your text (again, note that X sub 3 means that X has 3 as a subscript).
Page Number 
Line/ Location 
Correction 
p. 207 
7 lines from the bot. of the page 
Change "more than twice as large" to "more than four times as large". 
p. 302 
First equation (1/3 down page) 
The means in the numerator of the equation, 208 & 206.4, are incorrect. They should be 158 & 156.4 (as in Table 11.1). The result of the eq'n remains the same. 
p. 368 
5 lines above Formula 13.5 
Should read: "...it relies on sample variances in its denominator, instead of population variances, which are usually unknown.)" [The “which” clause should be moved to the end of the sentence.] 
p. 423 
Line 10 
There should be four means enclosed within the parentheses: 25.0, 25.6, 22.6, 21.4. 
p. 473 
2/3 down page 
"S sub =" should be "SS sub =" 
If you have printing number 2, please add the following two corrections in your text:
p. 469 
Line 6 below table 
Should be: "32 * .386" (add a multiplication sign between 32 and .386) 
p. 589 
Line 15 
should read: "... greater power for pairwise comparisons ..." (the word "pairwise" should not be capitalized). 
If you have a copy of the first printing, you need to make all the corrections indicated in the table below.
p. xxxi 
Preface for the Instructor 
The url on the middle of page xxxi is not very helpful. Go to http://www.wiley.com/college/psyc/cohen345822/instructor.html to find the instructor's manual and test items (you will be prompted to set up a password). 
p. xxxiv 
Preface for the Student 
The url 3/4 down the page is not helpful. The only item on the student web site (not password protected) is the set of computer exercises (including data sets). Please go to: http: //www.wiley.com/college/psyc/cohen345822/student.html for this material. 
p. 73 
Line 14 
Should read: "Sum X N m", instead of "Sum X Sum m". 
p. 76 
Exercise 9 
should read: "value for s", instead of: "value for s " 
" 
Exercise 10 
should read: "value for s ", instead of: "value for s" 
" 
Line 9 
should read: "s sub new = C s sub old"(add the constant C) 
p. 88 
Formula 3.19 
Add " 3" to the end of the formula so that it matches the correct version of the Formula 3.19 on page 84 
p. 122 
Exercise 5, c. 
should read: "... below 70 bpm ... above 76 bpm?" 
" 
Exercise 6, d. 
should read: "... IQ below 90 and ... and IQ above 115?" 
p. 175 
Next to last line 
should read: "… to create an unbiased estimator of s sup 2 (the lowercase Greek sigma replaces the letter "s") 
p. 218 
Figure 8.3 
The Greek letter "gamma" appears as a label in each part of this figure, but it should be replaced in each case by a bold, lowercase letter "d" to indicate a population effect size. 
p. 222 
Three lines below Formula 8.4 
Should read: "…the letter g to represent a point estimate of d …" (The letter d in boldface replaces the Greek letter delta.) 
p. 253 
Exercise 10 
This was written in terms of and s with subscripts of 1 and 2, but it should have been and , with s having subscripts of x and y. 
p. 265 
Line 5 of next to last paragraph 
Should read: "whereas d is like a z score" (the Greek letter delta should be changed to d). 
p. 289 
Line 2 
Should read: "If b sub XY is less than 1, b sub YX will be greater than 1" (the X and Y should be reversed in the subscript of the second "b") 
p. 302 
First equation (1/3 down page) 
The means in the numerator of the equation, 208 & 206.4, are incorrect. They should be 158 & 156.4 (as in Table 11.1). The result of the equation remains the same. 
p. 379 
About 2/3 down the page 
Should read: "The way that the groups are ordered in Table 12.2," {not Table 12.1, as it reads now) 
p. 410 
Line 21 
should read: "calculate the BIASED variance" (add the word in all caps) 
p. 423 
Line 10 
There should be four means enclosed within the parentheses: 25.0, 25.6, 22.6, 21.4. 
p. 432 
Exercise 5 & 6 
Change "factor" to "effect". 
p. 445 
Exercise 4 
Label in Table should be , not X 
p. 469 
Line 6 below table 
Should be: "32 * .386" (add decimal point) 
p. 473 
2/3 down page 
"S sub =" should be "SS sub =" 
p. 477 
Lines 3 and 4 
On both lines, SS sub S X RM, should be SS sub G X RM 
p. 479 
Table 16.4 
The entries for SS, MS, and F in this table are a bit off (they are based on the first edition of the text, but the data have changed slightly in the second edition). The corrected table appears at the end of this errata page. 
p. 479 
Line 4 below table 
Should read: " individual subjects with word type (SS sub S X RM)." (change G to S in the subscript of SS) 
p. 486 
Middle of page 
Should read: " SS sub RM = N sub T " (not S sub RM, as it reads now) 
p. 495 
Exercise 2, a. 
Should be: "SS's" (the third "s" should not be a subscript) 
p. 542 
Middle of page 
The formula on this page should have been labeled Formula 17.15 
p. 546 
Exercise 2, c. 
Should be: "(square the result of Formula 17.10)" 
p. 554 
Line 22 
Change first word on this line from "predictor" to "criterion" 
p. 560 
Exercise 6 
See Instructor's Manual for changes to the data for this exercise 
p. 566 
Line 18 
should read: "which is equal to zero minus ..." (change m to zero) 
p. 578 
Equation before last paragraph 
The denominator that reads "81" should be ".91", and the next denominator, which reads ".81", should also be ".91". The final answer should be 3.36, not 3.78, but this does not change the conclusion with respect to significance. 
p. 589 
Line 15 
should read: "... greater power for PAIRWISE comparisons ..." (add the word in all caps) 
p.675 
Line 4 
delete line 4 and replace it with: "four of the minus scores are fairly small." 
p. 686 
Exercise 4, b. 
should read: "alpha = .01?" (not .03) 
p. 709 
Exercise 1B1g 
The sum is 285, not 240 
p. 712 
Exercise 4C6d 
The answer should read: "2 * (.2514)(.1587) = .08 
p. 716 
Exercise 10C1a 
The wrong formula was used to find the pointbiserial r in the answer key. The following would be an acceptable answer: 
p. 716 
Exercise 10C1b 
Does not appear in answer key. The answer is:

Table 16.4 (p. 479) should read as follows:
Source 
SS 
Df 
MS 
F 
P 
BetweenSubs 
381.4 
5 



Groups 
5.54 
1 
5.54 
.06 
> .05 
WithinGroups 
375.86 
4 
94.0 


WithinSubjects 
84.6 
12 



Treatment 
16.25 
2 
8.13 
5.61 
< .05 
Group X Treat 
56.76 
2 
28.38 
19.57 
< .01 
Residual 
11.59 
8 
1.45 


Total 
466 
17 


