Errata.doc

10/30/03

Errata –- POD I

p14, exercise 2.2 should read, "…either categorical or numerical…" (Spelling error)

p60, 3rd paragraph, line 3 should read, "…one outlier, 628 pages,…"

p109, example 4.6, bottom of page, should read,

(a) "The mean, , is much larger…"

(b) "…which is 18.00 for this data set…"

p111, problem 4.6(a) should read, "What is the mean property value…"

p116, next to last line should read, "…on average, the resulting value tends to be…"

p118, figure 4.7 should read "Leaf: Hundredths"

p121, problem 4.28, the coefficient of variation should be:

p125, exercise 4.30, the labels "Crunchy" and "Creamy" should be exchanged.

p125, exercise 4.31 should read, "…Sodium-Calcium Exchange…"

p128, Chebyshev's Rule #3 should read, "The values 18 and 54 are 1.5 sd's…"

p136, table near the bottom of the page, the mean for nonsmokers should be 961.

p157, figure 5.8, the "strong" correlation should go from 0.8 to 1.0.

p164, exercise 5.14(d) should read, "conclude that test anxiety caused…"

p171, 2nd bold line in the first paragraph should read, "…outside the range 8 to 65…"

p178, table 5.1, Patient #1's age should be 35.

p253, example 6.12 should read, "…equipped with a single CFI switch…"

p269, exercise 6.45 should read, "Y = event that… is 18 to 25 years old.

p278, at bottom,

p279, then, should read, "So, means that, in the long run, 5.96%…"

p296, exercise 6.83 should read, .

P313, example 7.6 should have . Also, it should read, "22.3% of new

automobiles had _3_ major defects."

P342, first paragraph should read, "……"

p359, example 7.26 should read, "An answer…would qualify for MENSA…"

p364, exercise 7.68 contains an error of omission: 1 lb is equal to 453.5g.

p384 exercise 7.103 should read, "Find a number c such that 95% of all cars

of this model have efficiencies exceeding c. (that is, ."

p418, example 8.7 should read, "…between 11.96 oz and 12.08 oz…"

And the Lower limit should be .

p423, first line should read, "… and F a male student, …"

p466, example 9.12 should read, …

p469, problem 9.44 should read, "…the mean and standard deviation were based…"

p469, problem 9.45 should read, " … serving for 16 popular …"

p479, second line should read, "… the design specification in. However…"

p493, toward bottom of page, should read, "The value p = 0.679 is a bit more than…"

p500, problem 10.25 should read, "…the study had included 100…" (See errata for

answer 10.25 below.)

p507, in Step 7 the formula for t should contain rather than .

p515, problem 10.52(c) should read, "…instead of .10 in the test of part b,…"

p516, bottom of page, should read, "…mean and asking, Does this…" (Space added)

p525. The sense of 10.57(g) is, "If is rejected when and "

(That is, and are not the same thing.)

p539, the Test statistic should read,

p552, problem 11.14 should read, "…data on weights of 20 fish…"

p563, next to last line should read, "…the mean increase in blood …"

p566, problem 11.41(a) should read, "Why is this interval narrower than…"

p575, problem 11.58, the sample proportion for Impulsive should be 0.310.

p603, at the bottom of the box, it should read, "expected cell count…"

p650, problem 13.8 should read, and .

p718, problem 14.15 should read, "……"

problem 14.15(d) should begin, "If SSResid = 30.1033…"

p832, answers 5.65 – 5.69 are erroneously labeled as 15.65 – 15.69.

p834, answer to problem 7.21(c): there is no such problem.

p834, answers to problem 7.37(c) are 126.808 and 13.316.

p837, problem 10.25 answer should be, z = 7.56." (See errata for problem 10.25 above.)

Errata –- POD Solutions Manual

Page 3-7, Exercise 3.11(b). The GPA group labels are reversed. From top to bottom, they should read: 1 -< 2; 2 -< 3; 3 -< 4

Page 7-31, Exercise 7.102(a)

Page 7-31, Exercise 7.103(d)

We want c such that . This will occur when, or

.

Page 7-31, Exercise 104(b)

Let K denote the amount of time exceeded by only 10% of all clients at a first meeting.

Then implies that . So K=72.816 minutes.

Page 7-32, Exercise 107(b)

Page 11-2, Exercise 11.4 (a)

Let denote the true mean elongation (mm) for the square knot, and the true mean elongation (mm) for the Duncan loop using Maxon thread.

Assumptions: The distributions are at least approximately normal and the two samples are independently selected random samples.

So (rounded down to an integer)

The P-value is for all practical purposes equal to 0.

Since the P-value is less than , the null hypothesis is rejected. The data supports the conclusion that the true mean elongations for the square knot and Duncan loop differ when using Maxon thread.
Page 11-2, Exercise 11.4 (b)

Let denote the true mean elongation (mm) for the square knot, and the true mean elongation (mm) for the Duncan loop using Ticron thread.

Assumptions: The distributions are at least approximately normal and the two samples are independently selected random samples.

So (rounded down to an integer)

The P-value is for all practical purposes equal to 0.

Since the P-value is less than , the null hypothesis is rejected. The data supports the conclusion that the true mean elongations for the square knot and Duncan loop differ when using Ticron thread.
Page 11-3, Exercise 11.4 (c)

Let denote the true mean elongation (mm) for Maxon thread, and the true mean elongation (mm) for Ticron thread, when using the Duncan loop.

Assumptions: The distributions are at least approximately normal and the two samples are independently selected random samples.

So (rounded down to an integer)

The P-value, using Table IV, is about 0.247.

Since the P-value is greater than , the null hypothesis is not rejected. The data is consistent with the claim that the true mean elongations for the Maxon and Ticron threads do not differ when using a Duncan loop.
Page 11-7, Exercise 11.8(a).

The answer given is generally correct; however, for the specific means and standard deviations given, the means are less than one standard deviation above zero. For data that must be non-negative, this is a clear indication of skew. The question "as answered" is actually slightly different than the question asked. The question asked was about the reasonableness of assuming normality; but given the information one can go beyond the "not sufficient information to assume approximate normality" to a "sufficient to seriously doubt approximate normality" response.

Page 11-19, Exercise 11.19

Let denote the true mean alkalinity for upstream locations and the true mean alkalinity for downstream locations.

Assumptions: The distribution of alkalinity is approximately normal for both types of sites (upstream and downstream) and the two samples are independently selected random samples.

So (rounded down to an integer)

The P-value is for all practical purposes equal to 0.

Since the P-value is less than , the null hypothesis is rejected. The data supports the conclusion that the true mean alkalinity score for downstream sites is more than 50 units higher than that for upstream sites.

Page 12-2

Pages 14-2 and 14-3.

For exercise 14.4 (a) and (b), the formula should read…

for variable .