Semester One Final Examinations, 2018 STAT1201 Analysis of Scientific Data AC THE UNIVERSITY OF QUEENSLAND AUSTRALIA Venue Seat Number Student Number This exam paper must not be removed from the venue Family Name First Name School of Mathematics & Physics EXAMINATION Semester One Final Examinations, 2018 STAT1201 Analysis of Scientific Data This paper is for St Lucia Campus students. Examination Duration: 120 minutes Reading Time: 10 minutes Exam Conditions: This is a Central Examination This is a Closed Book Examination - specified materials permitted During reading time - write only on the rough paper provided This examination paper will be released to the Library Materials Permitted In The Exam Venue: For Examiner Use Only Question Mark 1 2 3 4 (No electronic aids are permitted e.g. laptops, phones) 5 Calculators - Casio FX82 series or UQ approved (labelled) 6 One A4 sheet of handwritten notes double sided is permitted Materials To Be Supplied To Students: None Total Instructions To Students: This exam has 6 questions, each worth 18 marks. You may attempt at most 5 out of the 6 questions for a maximum of 90 marks. Write your answers in the spaces provided in this examination paper. This paper has 18 pages, including Tables and Formulae Additional exam materials (eg. answer booklets, rough paper) will be provided upon request. Page 1 of 18
Semester One Final Examinations, 2018 STAT1201 Analysis of Scientific Data Question 1 Whenlsomelplantslarelattackedlbylleaf-eatinglinsects,Itheylreleaselchemicallcompoundslthatl attractlotherlinsectslthatlpreylonlthelleaf-eaters.IAlstudy1|carriedloutlonlthelNicotianal Attenuata plant, native to Utah, USA, investigated the emission rates of such chemical compoundslwhenlexposedltolthreeltypesloflleaf-eatinglpests,Inamely,IthelHornworm,ILeaflbug! and the Flea beetle. A control group was also included to establish the baseline chemical emission of these plants under no duress. A total of 32 plants was used in the experiment, with eachltreatmentlgrouplconsistinglofl8[plants.ITheldatallarelplottedlbelow:I Chemical compound emission rates across four different pest conditions 100 O O O 80 n 60 Emission rate (ng/hr) 40 000 0 20 00 0 0 00 O O 0 0 0 0 0 0 O Control Hornworm Leaf bug Flea beetle Alpartially-completelanalysisloflvariancel(ANOVA)Itablelforltheldatalislgivenlbelow:I 0 Pest condition 0 4675.50 Df Sum Sq Mean Sq F value Pr(>F) Error 13896.10 0 a) Do different pest conditions lead to different levels of chemical compound emissions in Nicotiana Attenuata plants? Answerlthislquestionlbylcarryingloutlanlappropriatelhypothesisltest.[YoulshouldIclearlyl statelthelnulllandlalternativelhypotheses,lgivelboundslforlthelp-value,landIwritelal conclusionlinlalmannerlthatlcanlbelunderstoodlbylanlecologylresearcher.[[9]marks]] 0 n 0 0 0 1 Kessler, A, & Baldwin, I.T., "Defensive function of herbivore-induced plant volatile emissions in nature", Science, 2001. Page 2 of 18
Semester One Final Examinations, 2018 STAT1201 Analysis of Scientific Data b) Briefly discuss the assumptions you made in answering part (a) and assess their validity. YoulmaylfindIthelfollowinglfiguresluseful.[[5]marks]] Residuals plotted against pest conditions QQ-plot of residuals against normal distribution 0 20 30 10 8 I Residuals o 0 0 O 0 0 O 30 10 20 Residuals 0 O O O 800000000000 -30 -20 -10 0 O n Oo 0 O 0000 0000 0000 -30 -20 -10 0 o 0 0 0 Control Hornworm Leaf bug Flea beetle -2 -1 0 1 2 Theoretical quantiles 0 0 n n 0 c) Dolalllthreeltypesloflleaf-eatinglpestslinducelhigherlchemicallcompoundlemissionslfromlthel Nicotiana Attenuata plant compared to the control condition? Answer this