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 “real-life” so it reads like this: "… and we know that real-life 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 One-Way 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 two-way 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 |
Upper-right 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 |
Lower-right 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 lower-case 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, lower-case 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 |
|
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 |
|
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 point-biserial 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:
|
and s with subscripts of 1 and 2, but it
should have been 
, with s having subscripts of x and y. 
Table 16.4 (p. 479) should read as follows:
|
Source |
SS |
Df |
MS |
F |
P |
|
Between-Subs |
381.4 |
5 |
|
|
|
|
Groups |
5.54 |
1 |
5.54 |
.06 |
> .05 |
|
Within-Groups |
375.86 |
4 |
94.0 |
|
|
|
Within-Subjects |
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 |
|
|
|