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Unformatted text preview: PS'i'C 2D13lFall 2011.) Exam r42 Nmnr': _ General Llia1I~>L1it>I1a:WIElr wur Hume ohme. Writs: all answers on these pages. ior Multiplechoice items, their; your an swer choice
If you change your answer, ma let it LinIr wlIIl your ﬁnal choice is. He sure to show all work you oid to mme u]: wiLh your an mere; if
you make math errorsr you malt Hml‘rhr'ls'sﬁ Et‘T credit iF '.I':'L=' followed the correct procedure. If you tend to he rnessalr, please underline or put holes around 'p'CIL'T answers [I'IIL'uPI'EI'IElt'ss riluasl: tn. to write neatﬂrl. There are If? possible points; your were will
l1I' the [Rummage of these point: that you earn. Good iutli! PJ‘lHTl Multi le choice uestions each robinMs point value is indicated before the nrablem For this part of the test. for tech question choose the one best answer. 1] [2 points] J‘ bd1PliHﬂ tlislliisulitsn u:l means consists of
r . t
'"r a. all the scores contai nod in a particular 53 mple
h. all the tront. rxirituinud in a 5 pacific population
LI". jhe sample mean.“ ior all Elm putbible re ndtlm samples lof a specific sizel from a particular population
the sample means for all the possible random i,::urnp'il_‘i,' tfur all saw ple sings] from a particular pnpuletign ." 2i l1 paints] In a hypothesiz Lcst using I, the "critical region" [the Isscu “'2”: [bill haw: an absolute value greater than or equal in.
I” I] consists of
/ :
L/
:1 sarrltllt' values lhat are very likely" to he obtained if HiI rs trotL
'I
Cg: sample ad'suEL that are very unlikely to be phtainelj if Ht, is, true
(EL Esample traiues that provide proof that H... is lEIIQ sample values that provide proof that iI;I is false 5:! :2 points] .u'tseurrle ".lI.J1. :J 11u1rrulllr distributed population hasp  EII'J and a: ZIL lfygu tout: dil uptgib'lu Hrspies Elf size n ;
16 rrorn this population. and found the mean for each sample, the mean at all those wean: mum be . u
r[aux] I‘l e. EBB
:_ '3: W i. 1
r at .3.
cl. 'e .a{iy ra n't be r. etermincd =1] [2 palm] Asst: me that a normally distributed popuietion has = .ti and .r = 311. IF upu melt alt possible samples. pf size n .—
rLf 15 from this populatinﬂ, and inuht! The Intan for eaeh sampler the standard deviation ofall those meant. wuulrl be a 3'4 t sh... ' n e. Ellil
l:I SCI i‘ 1
t:. 74 J [I
.5; 
E h it. can't lut dthttlrminptl 5i {2 points} For an indepen dent5a mples study, the value of cam.3 d h tips In: describe a. the risk ofa Tuuu I erroi h. e rlsx ofa flrue II eurur c. i'ID'lN much difference there is between the mt: trepth rm; :1. whether the difference between the two treatments is liker 1n l'IEI'L'r: umtlrmd tr, chance El {1 polnlsl which of the [pi luwin}: dostrisz the effect ofincrea5.ng the alpha level (for eica mpte, frw_.t]11_u .051!
1'2 ._
3’" a? increase the likelihood of relecting HE and Increase the risk pf a. T'f'pel error
‘ decrease the likefihood of reJ'Fcting Hg and increase the risk of a Type lurrur "1? c :
rga“ increase the likelihood of rejecting Hg and decrease the risk ofa Type I en m ' _ dt'nt'a'se the likeiihood of rejecting H" and o'eLrease the risk ofa lyrpe I error 5—K Killiii" .rI I 4'] 5]
ear. [1 points: When is there a risk of a T'l'pel error':1 @jﬁt'henever Hg is rejected ls. whenever Hg is retained
c. whenever H; is reiected o. the risk mi in Type1e1rerisindeotndentofthe Ij I:I:i siren from .0. llypu‘. hear. Eleni [Z polnlsa which pfthe following mi N Increase the power of a statistical test? lChange alpha fren' .CIE to .411.
{ha nge from a one tailed test:
test. a.
is. re}, Change the sample size from n = 25 p: n — lEIIZI. p a twp toilcol oi. None of the above. PART II ﬁsher: answer and "wordEroblem" Wtilﬂjﬂiﬂ] Eroolem’sjeint sales; is inﬂieeted before the pr poleori til
___
e' 11]]
L4. 11] 6 [5 points! Answer the questions helpair with respect to a normal population With 14 = 90. o = IJ. a. {3] What is the probability of obtaining a sample mean greater than BE For a random as moll' with n = 41 somes?
5 ' '1 E1 i.
'k . p3  _ — : .. _ s . _ _
. 1.; L } Jib _ _I.:__'IEI"qufr_z
_ 'I'L, ' 5’. CI _.
: “L'sf. = —_—— 
a h. [2] If n were greater than 4. say what would happen so the probabflitv in part a [would itﬁo up, down. or stay the
a} some]? IBeIiell'ri say win.r we LlH'JSI: your answer.
L—r' . '  . .. . '.;~ :.
’3 :«. ' _—   e we: is .: 3'  :Ic' . “9* —. =+ 3&3. .I thinJ's .5
'I' f" '_. '_ .. ' .J' u Eg._._ etc: xC'l Call '52.: "4:
' ' we .  . u if, sif— 4 paints] :1diLa:e.r.rlle11er the felinewing statemenss about the standasd error of the mean [EH] are tsue cur false. The uIanulascl Hrmr of the mean is a standard deviation. 5 I in: 11 The stanrlard error nf The mean roughly meawres the fepatal amount by which The TI. r‘hims nfsampies taken from a population elemate from the population's mean. T'f‘ E
c. The standard error of the mean measurestnarialsilil'a.I in a particular sample. T": :11: __ _ __
o. The standard error ol the mean increase: in value with larger somrﬁe vices. "_'_.___._'_~‘:_L {6 points] Evesemi l'aetclrs influ ence the ‘ualue obtained For the independentsamples 3 statistic {that Fs. tmj. Some factors affect the hem eratprand pthers influenpe the denominator. For each of the lpilowine. indicate the circling epor choice]
whether thcfnnur influonncs the nu rnurillrar or denomination 11‘. His; r statistit: and dtrl¢ra11irm wlu—s'lllee: 'll‘lH Effect wuulc‘l L1H Iu lrlc:reNIM the wine uft [fartIuer from zero] or decrease the value of t [cipser to zero]. In each case, assume that all other
factors remain constant. a. :2} Decreasing the differenc etween the two sample mears ..
E affeeE the/mus? pr denominator pauses 'm et _fer s 7p m. smaller
in. {1} Decreasing: the size of the two samples affects the nu merator prfdenominatEFj :2] Decreasine the size of the sample enhances '  —_—"—.
r dtrlﬂrﬁllﬁﬂﬂEJ /
r'—.—~— causesﬂo‘eﬁmeeﬂr [to gel smaller causes. [_lr_1 gel. higggr DesiED get Ema—"EFT: L'.
a—. L,» affects the nu merelor p 12] {3 points] Research suggarts that children with AGHEI tend to watch more "N than child ren who are not diagnosed with the
disorder. To examine this, a researcher obtains a random sample trl n = 36 children [ages 3 lo 12 searsi whcl have been
31 diagramrd with Mill ID. lads. child is asked To keep a journal recording hnw much time each day is spent watelitng 'I'u'. The
/ average inr the Lilitplﬂ is M = ILEI hoursa'da'p. It rs known that the average time for the general population of Beta1 IIl'ear
old children isp = 4.1 hoursfda'f with cr = 1.3. is new associated with an increased angourit of W—watd'iing? EM.
3 a. in What kind of hypothesis test is appropriate here? 3 '9‘”? I'E‘ ' ‘3: I " ' :3 I ' “'ﬂ’!’
i. is. ill Brief“hr describe the population being studied. ‘
' “(PE, _'.._,i__L!_ “.7in _ .".'_ ,_ I.I';'. T: :'_I ' a: _' ~ ._"  ' . ‘3
v"
i t.. I. }\lU!.i'_,{4IP¢LJ*;.: LL": “if;
:‘l'fii _ Lip7L3.) M 'j . :__:_‘:_ _ __Lé__.' k _ e. E] State the null and alternative hypotheses in plain Engiish. L' : 1 .. . _. . ._ .
itﬂ. ..I t I . . 1. . . u I — f. [1} what is the critical traiue of the test statisticr assuming :1 = .IIIEEI lie sure that this is consistent with whether H; is one or two tailed. If you use df to fincl this value. please report it. . ‘1
13 13 pointsh ﬁssurnc: Lhal. riusrrlal buds} [elaspuralu rt: lur llii:::.,5l'.h',,I humans is 936‘ F. lffliglﬁl'l'lt.‘ Li'iul. “It: are iraterusted in seeing il
living longterm in a. Iren cold environment is associated with a. lower lapelIr oernperature. in. group of 25 people who liene
.I worked in Antarctica for at least three months have their body temperatures measured when theyr are heaEthyr, an cl the ' mean at their temoeratu res is found to be 9?.4' F with a standard deviation ol1.5.ls the lJCIIZl‘g." tetn perature of those with
lungterm thptnurle 1.” .I liner}, told Hrwilﬁnrnenl lllilwllr than that Iii humans. in general? ' a. [ll What kind of hypothesis test is apprepuiate here? 43"?” ‘ ‘ M:.' . 2‘ "' "' i '“ “If
I b. 11! Brieﬂy descrihethe population being studied.
1.11% pﬁﬂu all": :2. I__ at}. I m _ I“? . I .:  I :_ _ I, J J
has. . .r  ' ; vii33.1? c1; ‘
 . . . '7
I; c. lllwhacisthe dependentuadahle? ' ‘ __. '.'_‘  __ : a' d. 12! Stole the rrull and alternalit‘efreseart'h lnrpotheses in terms of parametersfsyrn hols.
. I_ . .
I'MUH  U FI?;..I_E__I_:_ IL. . t.. ..Il [ﬁrLglé' rIIIII In"  I "i A—‘—‘. vrﬁ— W a I i. e. [2] State the null and alternative hypotheses in plain engiish. ' .I  ' x __ .'h I '.' _' .'. . .' _
Iijr _:_— 'Jt:.I._.,__ ..I . I__ I. 
‘E I . (If 1/ i. [1} whm is the critical traiue of the test statistic, assurning or  .EIE? lie sure that this is eansiscent '
II with whether Hi is one or twotailed. If you use ile to find this value. please report it. "E 14: :9 points] .n't research er would like to era mine how the chemical twptoohan. contained in Foods such as turkey, can affect
mental alertness. A sample at n = El tollege students is pistai necl and each student's perlprmante on a familiar eicleo game is
rrleuwred before and afte: eating tI traditierldl 'l'henltsttitrinr: dinner [irltlutlinﬁ Lurker] The average more dropped by .'I'l= 14
points often the meal with 55 = 1133' for the diiierente scenes. I: inlet391mm associated with: u ehanﬁe in mental alertness? "I it E. r, iJ. : Li. L'.
'3'
I... r.
.= f: .5
t nona ' _  . 1 _,._. Fl”"”,. {1] 1t‘i'hat kind of hypothesis test is apptepriate here'. {1] 1.Nhatis the independent or quasiindependent variable? . :' .' " L s. at... {1]1u'li'i't.lis1i1t' dependent 'tl:.;tri:l::t::I Hoff}: '. '3'" I {1]  low is the deperltier'at variable rrIt'asered? J: L..'I . '_ " '_ _  . .
Hots, 1.2:; ._ . ;  .  {2] Etate the null and alternativefreseorch hypothues in terms of parametersfstrmlsols. I
I z . 
ﬂ _.g‘LL—‘Iil‘iﬁi’l t.____ _." f‘ﬁ_ "
. — ' 2 5 {Mi—5h {25 State the null tilId ulternutiue hwptheses in plain English. I. hunt1f J.   ' t  _. _ Tuvalu {1: What is the critical ta luc of the test statistic. a ssumingttr — .05? Be su ret’nat this is consistent
with wheth er H". is one or two tailed. It you use of to fincl this value, please report it. ~ 3' z a; lit [9 [itinnii ﬁt resetirt'heur t'urrtlt‘t'ts an ex perirrlent to examine how serotonin ta chemical involved in neutal processes] is S retateei to aggression. Dne sample of rats serves as a control group one receives. a placebo that does not affect :I1urrrl.s
serotonin levels. :5. second samn"e of rats receives a clfugthat lowers blain ieeels of serotonin. Then the rﬁearcher tests the 3m mals bl.. recordlne the nu mberefamressme responses each of the tats displates. The tie ta areas Inﬂows Low serotonin M: 1!]
55 352 h ..
{I _ {ii'u'tlhatistheindepenclentorquasiinclepenclenteariahie? _'5 ._".it_' ' .' . ' ’ {1} What is the depend ent variable? ' Ill How is the dependent variable measured? [2! “State the Neil and alternatiuefresearc'h hypotheses in terms of paramemrsfsym l:Ios. I . _ = _ I _l . Ft. / _' ..i—=.;'.L.irF ,
I ' ' {Act/v '_'_'_——# SMJ' “5—
IZI State the null and ulten'nuti't‘e hypotheﬁﬁ plain English. MEX
te. ... = ._Io._s .V ._  .. s»
_. '   __ 't. (/2
1 s ‘  . . . . t/  ' . 1 b.ﬂ_f—UII.I .:I I “5.. E...:i\ 3 __.:II__, .I_, Ix
' ' "K said“ ' l' «2’
"— —" L__ W —'.'7=L Lee”
til What is the critical value of the test statistic. assuming ct = I2I5r1 Be sure that this is ten slstent
with Whether H1 is one or twptailed. I! you use tﬁf‘ntl find this welt: e. priciest: report iT.
of}: _ZI d Tulle; "I;
It_t ' ' 1— ‘' 1'5] {12 DEFINE! Chﬂﬂﬁem problems {and IIII'II'I' twoll ffﬂm arrlorlﬁ Problems 1215 and perform the remainde: grum
Wpﬁthﬁiﬁ tealll mintc ll": Uri lical val ue you generated to make a decision {thuut H“. Be sure 11:: 591ml: any :nmputatIans um.
I. 1 6 perform. dearly label the chewed value of the test statistic. deadr write your decisiun about Hg, and state a cmdusion
I that mentions ﬁle pnwhﬂms being studied as well as the independemand dependent variables [make sure 'p'ﬂur
EOI'ICIUSiGI'I is Mt SEI'I'IFhl' "Fﬁl'éﬂ Hu" ¢F"F:Ii114.1 mien Ha". but instead an answer to the FDGK‘arch questionl. Also, iFthe null h‘s'liﬂlhﬂﬁis i5 rEjE‘CL‘Ed. ﬁnd Cohen's I'J'. [J'lﬁSume that all uniumptiuns underlying the use afﬁx! FTESI' Du PILL5, urc met}
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 Spring '08
 McDonald
 Psychology

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