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Unformatted text preview: Psy 60 Midterm 01 Spring 2007 PID: Multiple Choice 1 1 Written Answers “('3‘ ' :3
Extra Credit \
TOTAL 9 ‘9 ‘ 9 Pascual nan
pid Ail questions are worth 1 point unless otherwise noted.
qO‘i. A researcher is interested in the number of swear words Americans use per day. She randomly samples 200 Americans and ﬁnds that her sample swears with a mean of 10
swearsiday. What is the most likely rate of swearing in the population of all Americans? . . "n " 1.0
(a) 199 (c 201 5W” L
(b) 200 none of the above
q02. Jimmy wanted to use his sample's data to infer the variance of the population. He used the
following equation to calculate the variance of his sample: 31 L
N 2 “—‘ "’ EL C x i at»)
205i TU“)
£=l “ ' I“
N
Jimmy's estimate of the population variance will:
/ (a) be correct @underestimate the population
variance
tb) overestimate the population {(1) cannot be determined
vanance
q03. What is the median of the following data? I U Kr r I ,
age (in years) = [20, 34. 21, 22. 25. 33, 100, 24. is] I, ~T' . r“ "  ""
(a) 22 c 25
(b) 33 r (d none of the above (104. Two researchers were arguing over the results of a study. The first experimenter claimed,
"Love cannot be measured by hugs." The second said that. "Hugs are a sign of love." Their
argument is primarily over: (a) internal validity  (c) he relationship between abstract
concept and concrete observation (b) external validity (d) the existence of an abstract
concept q05. A researcher wants to know if laughter cures diseases. The rate of disease recovery is: (a) an independent variable  (c) both 'a' and 'b'
a dependent variable (d) none of the above
Emu: q06. Procrastination can be measured by the percentage otﬁimela‘day that you spend browsing
on online social networks such as Facebook. This is an example of which measurement scale? (a) nominal (c) interval
 (b) ordinal @ratio
q07. What proportion of the normal distribution has z—scores less than 0.25? (l ' {X
r (a) 0.4013 c 0.250 t i \w /_, t
(b) 0.0987 (d)‘none of the above ___‘:_:L.,3. / xi
.3 5
."tsi
midterm 1 page 2 of 8 Psy 60. SPR 2007, Pascual , .5 ti“ (108. A survey was sent out asking people if they liked to play video games, and people were to
respond either "yes" or "no". The data being collected was of what type? @qualitative (c) quantitative ) ratio (d) none of the above q09. A survey was sent out asking people if they liked to play video games. and people were to
respond with an integer between i and 10, where “1" indicated hatred of video games, “5" was neutral feelings toward video games, and “10" was obsession with video games. The data being
collected was of what type? (a) qualitative @quantitative
(b) ratio d) none of the above Use the following story to answer questions 1013. A researcher obtained the diameters of 100 marbles, and calculated the mean, median, range, and interquartile range 00!?) of her sample. Afterwards however, she realized that she written down the diameter of her largest marble incorrectly: she listed it as being 4 cm in diameter when really it was 8 cm in diameter.
,~' ' cﬂb} \wV‘AY‘33 hm dc! ‘MLJTt— ow. Recalculating her interquartile range (IQR) , she can expect: a (a) the new IQR to be larger @he new [OR to be the same
(b) the new IQR to be smaller (d) cannot be determined qf‘l'. Recalculating her median, she can expect: ﬂ
(3) the new median to be larger thJ/ihe new median to be the same
(b) the new median to be smaller . (d) cannot be determined q12. Recalculating her range, she can expect: @ihe new range to be larger (c) the new range to be the same
(b) the new range to be smaller {d} cannot be determined q13. Recatculating her mean, she can expect: /' ‘\
We new mean to be larger (c) the new mean to be the same
(b) the new mean to be smaller , (d) cannot be determined q14. A researcher recorded sock length and no other information about the 100,000 socks in her
sample. Her data are distributed: The researcher should report which descriptive statistic? (a) the median three modes
(b) three separate means d) none of the above midterm 1 page 3 of 8 Psy 60, SPR 2007. Pascual q15. Timmy scored 50 points on the exam. What is his zscore? (c 50
cannot be determined qt 6. Tommy scored 40 points on a nationwide exam. and scores from the population were
distributed normally with p = 56 and o2 = 16 pointsz. What proportion of pepple scored better than Tommy? (a) O
(b) 1 a, "i $099997
Q d} none of the above q17. Johnny did better than 0.99 of the pepulation of test—takers. What was his zscore? @333 Int , ' 0:26 (a) 0.1587
(b) 0.00003 .Lt‘i (c) 1.0
(d) none of the above rats, A researcher wanted to know the effects of saying "please" on the percentage of times you
get what you want when asking for something. The population of people that ask for things get
what they want 50% of the time. with a population standard deviation of 10%. A sample of 55
people saying “piease” got what they wanted 80% of the time. Does the sample of people saying
“please” differ from the population of people that ask for something (a = 0.05)? /V\. .c a (.
(c) sometimes (at/ties ._
(:1) cannot be determined I J ,‘._ .4 _. 7.7 N 7 lit:  : . _
., _: ' oil (6ch (119. if the mean of the test is 50 with a standard deviation of 10, and I give out “B's to people
with test scores between 60 and 70, what proportion of students will receive a “B” on the test? ' (a) 0.3413 ll .. @0133; '  "  g .r . _
(b) 0.158? ' "'""'_ (d) none of the above d ' ' '
"" out“ rqsazrwtosle
q20. A researcher measured the ages of people that race BMX. What illustration should be used
to describe the distribution of data?
a) Venn diagram to) bar graph
‘9. histogram (d) none of the above
q21. The ,ovalue represents
(a) the probability that the null is true the probability of obtaining a
statistic given that the null is true
i (b) the probability that the alternative (d) none of the above
is true
q22. Random assignment of subjects to experimental conditions without random sampting from
the population has: _
{7 in}! 3? «l'or '3" .v' internal validity (b) external validity (0) both ‘a' and ‘b'
(d) none of the above midterm 1 page 4 of 8 F'sy 60, SPR 2007, Pascual name
pid q23. Give an example of_ an abstract concept that gives rise to two concrete observations. Make
sure to give the units of measurement for your concrete observations. (1 point) q24. Give an example of an interval measurement scale and an example of an ordinal
measurement scale. (2 points) ‘4. l".'\ Rev val V‘ﬁLa SUVCW‘wC'r I (“(dflbd‘k" LN: qr [by "’Z‘CQMG‘R Jig“ . IIII r '1! 2 . I u. \ r : yr ' uvclmn LK Mﬁagu vwthr T "TERA. RufﬂeMS News“ [w JERUILJ irl \
O "In “luk— "{\ Cr“? Q“ 0’ ,LD W0‘xkd\ R \K‘: k am «5. 0—“) leﬁ, ,.\~’L midterm 1 page 5 of 8 Psy 60. SPR 2007. Pascual name
pid q25. A sample of 35 college students bought an average of 10.3 DVDs per person last year. The
national average of DVDs purchased is 12.3 per person with a population standard deviation of
4.2 DVDs per person. Do the college students differ signiﬁcantly from the nation in DVD
purchases? Please show all of your work. (8 points) xv»: l2
(3: ‘1
m: age”;
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O J I"{' < c9 YtLilétti3_o i‘lo ll. I. .HQ @ \{eg ' (xxK936: ‘ﬁhéfﬂl‘xi dtﬁkﬂk cg'iﬂwiqugimrrlikl 19mm riLue {/‘L‘a‘il M I f, a _ _ I_ . \. fnL'Cui 3
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'l L." I midterm 1 page 6 of 8 Pay 60. SPR 2007, Pascual nam
pid q26. A researcher measured how pink the feathers appeared to look ironi a sample of
ﬂamingoes. “Pinkness” was measured by using reports from observers who noted subjectiver
on a scale from 110 where “1" was not pink. "5" was medium pink, and “10" was very pink.
Calculate the (1)'lQR and (2) standard deviation of the following data and (3) mention which is
the correct measure of dispersion to report. Make sure that you (a) show your equations, (b)
show your work, and (c) draw a circle or box around your ﬁnal answers for parts (13) of this
question. (7 points) Here are the/data, in units of "pinkness": n = 11:
{3.0, yam/£3, 6.3, 6.3, 6.5, 7.2. 3.9, 9.3. 9.9] @lQRE a 5
[i' ' Etta/“’2' a midterm 1 page I" of B Psy 60. SPR 2007, Pascual name ‘:’ pid
extra credit 01: A good student comes to ciass on time and pays attention from the very beginning. List all of the artistsibands of the songs that I played for you as class was starting. (1
point. and. yes. you have to list all of the artistsfbands for that measly pomt). r DWI tutu. (l' . :"tﬁr c {:K'ﬁr 9W3 "t: extra credit 02:A good student pays attention even until the very end of class. What do  always
say to you as we and lecture? (1 point for the full phrase) Vic PRU“; l\ 5 ((I KIA i.‘ k \ ‘fIIL{‘t.l' (:1; ref}, ‘ All together. there will be 2 points available on each exam. which means that the total number of
extra credit points possible is 6. Since each point on an exam equals 0.5% of your final grade,
this means that you can bump up your score by an amazing 3%. However. all extra credit will be nulliﬁed if you fail to complete all of your required experimental hours! By signing this waiver. I give permission for my test score to be posted on the Psychology 50
website. I understand that my student ID number will be used to identify my score. midterm 1 page 8 of B Psy 60. SPR 2007. Pascual 9Discussed in Section 6.5. 0.92
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 Spring '11
 Frohlich
 Standard Deviation, researcher

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