MATH 110 Midterm: Exam 1 Solutions Spring 1995

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turquoisegnu128

14 Mar 2019

School

University of Maryland

Department

Mathematics

Course

MATH 110

Professor

All

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 1

BiostatisticsforPublicHealthMidterm

October22,2013,3:00‐4:15



StudentName(print)______________________________



Iagreethatthismidtermisentirelymyownwork.Ihavenotreceivedorgivenany

informationtoanotherperson.Signature______________________________



Questions1and2:ConsiderarandomvariableXwithprobabilitydistributionasgiven

below

x 10 11 12 13

Pr(X=x) 0.1 0.2 0.3 0.4



1.Themeanofthediscretedistributionaboveis(selectsinglebestanswer)

A.10

B.11

C.12

D.0

E.Alwaysgreaterthanthemeanbecauseofkurtosis



2.ThevarianceoftherandomvariableY=3X+2is(selectsinglebestanswer)

A.9.0

B.11.0

C.1.667

D.1.0

E.Cannotbedeterminedfromtheinformationavailable





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 2

Questions3and4:Belowfindthestemandleafplotforarandomsampleof25

independentobservationsdrawnfromthediscreteprobabilitydistributionabove.



The decimal point is at the |

10 | 00000

11 | 000

12 | 00000

13 | 000000000000

3.Thestandarddeviationofthesampleaboveis1.21.A95%confidenceintervalforthe

truepopulationmeanis(showyourwork)



4.Intheproblemabove,ifasampleofsize100insteadofsize25hadbeendrawnwiththe

samemeanandvariance,the95%CIwouldbeapproximately

A.Onequarteraswide

B.Fourtimesaswide

C.Halfaswide

D.Twiceaswide

E.Fourtimesasprecise





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MATH 110 Midterm: Exam 1 Solutions Spring 1995

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