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9
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Qulz 3 (24
Chapters 7 -
N"."
Fall
201r
Stat 051
Sept.15,2o11Forrn
At B
!J
Directions: Read each question carefully and answer as clearly as possible. Pleasewrite neatly!
Encouraging quote: "My cafs breath smells like cat food."--Ralph Wlggum
1.
(4 Points) Students taking Psychology 001. are required to either sign up as subjects or to \vrite a term paper. Students in
Psychology 002 are not required to serve, but they are given extra credit if they do so. Students in Psychology 003 are
required to serve as experimentalsubjects.
Serving as an experimental subject may be educotiondl, but cuffent ethical stdndords frown on using "dependent
subjects" such as prisoners or charity medical patients. That is, dependent subjects should not be forced to participate in
an activity.
Based on this thought, which
Answer:
2.
PsYe{. oD3
ofthe three situations
5n\06^tr5
,
is
c/ea ythemost unethicol? Briefly explain.
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4^6
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19
SCil^A.
Dr. stat's library of literary classics includes issues of certain "scholarly" periodicals. The total number of issues of four
such periodicals, together with the percentages of Dr. Stat's entire library that they comprise, !s as follows.
Note: There are many more periodicals besides these four in Dr. Stat's entire library.
Periodical
Spider-Mon Soldier oI Fortune WWF Msgozine
Number
1s6;?6GJ
s2 :?6(,l')
26
% of Library
x
6.20/.
3.7%
a. (4 Points) Which ofthe three percentages in the table is incorrect?
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b.
(4 Points)
fils. 17.
Findthevalueofx. Give your answer
Answer:
lB.6r
as a percentage.
x.0.ty,)(
= ltr62,
There are problems on the next pagel
Mod Mdgazine
78
:160)
d/"
g.jr.
The Dow Jones lndustrial Average (DJIA) or the Dow 30 is an index which measures the level of trading of stock in thirty
large publicly traded companies. ln October 1987, the index value of the DJIA was 2,246 poinls and it dropped by 500
pointsinoneday. ln September 2008, the index value of the DJIA was 11,421 pointsand it dropped by500 points in one
day.
a.
(4 Points) ls the number of points that the DJIA changes by in a day a meoningful measure on how well stocks are
trading? Briefly explaln.
Answer:
fvvl as Tco irvFc ct!1^t6 0%5
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(4 Points) What value, related to the DJIA, is probably more meoningful in terms of measuring how well stocks are
trading in a day?
Hint: You do not need to know anything about the Dow 30 to answer this question. Just think about the change in
point value relative to the index value.
56e,,
4.
A\^(f.
(4 Points) The following sentence was written by a graduate student working on her PhD dissertation. The student was
paraphrasing a statistic from a prominent researcher who had been working on data gathered by the Children's Defense
Fund or CDF from 1950 to 1994. The student's sentence read,
"Bosed on dato gdthercd by the CDF between 1950 and 7994, it hos been found thqt eoch yeor since 7950,
the number of American children gunned down has doubled."
During the graduate student's dissertation defense, one of the advisors questioned the statistic presented in the thesis
and asked the student to do perform a bit of mathematics related to the statistic. SomeJhocking results were foundl
The stated statistic was not correct! Why was the advisor alarmed by this statistic? ln other words, explain the shockirg
results. Briefly explaln.
Answer:
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8onu5: 1 Point for being in class on the Tuesday following Quiz 3 Date.
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