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Unformatted text preview: F Investing at homeand overseas. Investors ask aboutthe d Reg ressuon PlOt
l  relationship between returns on investments in the United States an . Y = 570042 + 0.61969“
on investments overseas. M mt'rRE PVM‘PUN‘ 15 Shawn: Esq 21.5 %
(A Find the correlation and r2. 70
i9=al.S‘7¢, V=\l‘(3 ‘ so
(3:,3\S (3: Iatg 50 40 Y 5.9le
+ 30 overseas ‘ ” E. Find the leastsquares regression line of overseas returns on US.
returns. ' Ty 8.16042. Olol‘l‘iolLliC , C In 1997, the return on US. stocks was 33.4%. Use the regression line to predict the retum on overseas stoc The actual overseas
return was 2.1%. "zsnooqwsmﬁtqgoeﬁl
k526.71 oi  .
Circle the point that has the largest residual (either positive or
negative).
2 (_ tRCLLE commie? Axismew A Senator wants to know what the voters of his state think of proposed legislation on gun
control. He mails a questionnaire on the sub . ject to an SRS of 2500 voters in his state.
His staff reports that 448 questionnaires have been returned, of which 343 support the
legislation. C! r The population is the voters in—his state. / B) the 448 letters received.
C) the 343 letters supporting the legislation.
D) the 2500 voters receiving the questionnaire. 53. This is an exainple of urvey containing nonresponse. ) a survey with little bias because a large SRS was used.
a survey with little bias because it was the voters who elected the se t
D) All of the above. “a Dr. MVLT‘pLE CHO‘CL; B U40“ each) ‘ (‘0 FOI‘VH'E) Y:* .s'ﬁ / ./ a}. Dwmm \o% o . SMEQOM 9’3: \ momd Pudt‘£\~ Wm— m \o\°1°\ “the wwmxm Stow would bQ mppwwmwui l9 9. us (.511)(915=l0.mc\ ,
1°93 'IDX°01’19LD.\b\ 4 901. ugidpm = US , W .
T 15v \310 / LS. 021 ,, ‘ Auto accidents. The number of accidents per week at a hazardous I) rsh \' bother“ are 01: '.
intersection varies with mean 2.2 and standard deviation 1.4. This ’
distribution takes only wholenumber values, so it is certainly not New” z 9 ‘9'
normal. ' Smdund dwmh‘m = l ,4 NE; /
Let Tc be the mean number of accidents per week at the c ‘ ‘ 0‘ Li
intersection during a year (52 weeks). What is the approximate MW = “oma\ , distribution of 3c" according to the central limit theorem? This studm‘r \‘s «\th momma Explaining conﬁdence. A student reads that a 95% conﬁdence WW] *hﬂt W '9 (S O elm;
interval for the mean NAEP quantitative score for men of ages 21 0D ﬁdmﬂtﬁ Mi 12100] OF 3 Lo? . 3 1'6. to 25 is 267.8 to 276.2. Asked to explain the meaning of this interv , . k WQ (‘ka 7
the student says, “95% of all young men have scores between 267‘smﬁ'tfdiﬂmiﬁi'm mg n assign???  and 276.2." 15 the student right? Justify your answer. _
. mmhtms: s cm anemone a 
FD {UNL ﬁ‘S 9‘1 to .A Sample size and margin of error. The NAEP sample of 1077 young women had mean quantitative score 36 = 275. Take it as known that —. _‘_ Al;— on ‘
the standard deviation of all individual scores is a' = 60. I — E; 47»
. Give a 95% conﬁdence interval for the mean score ,u.‘ in the , _
population of all young women.  .... 
if?” 07% = m :1.in (“lit—m) Cnﬁdll
‘ ng *1 '3 . 333 90% 1545
2 31778.38 and 91H .143 ./ 95% 1.950 _ . ‘ 99% 2.576
\ . ( am. H DDT poisoning. Poisoning by the pesticide DDT causes tremors mug??'§%
convulsions. In a study of DDT poisoning. researchers fed several
rats a measured amount of DDT. They then made measurements
on the rats’ nervous systems that might explain how DDT poisoning
causes tremors. One important variable was the “absolutely refractory
period,” the time required for a nerve to recover after a stimulus. This period varies normally. Measurements on four rats gave the data
below (in milliseconds):2 —.. or, “it if 3/(5 d§—=n—I 1.6 1.7 1.8 1.9 (a) Find the mean refractory period it and the standard error of the
mean. (b) Give a 90% conﬁdence interval for the mean absolutely refractory
period for all rats of this strain when subjected to the same treatment. . I3
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