This question paper must be returned. Candidates are not OTHER NAMES……………………………….... permitted to remove any part of it from the examination room. STUDENT NUMBER…………………..………..
MID-YEAR EXAMINATIONS 2005
Unit: STAT170 - Introductory Statistics - I1/X1 Date: Wednesday 15th June 9.20 am Time Allowed: Three (3) hours plus 10 minutes reading time Total Number of Questions: Nine (9) in 15 pages
BOOKLET A Instructions: Please print your name and student number on both booklets. Answers to all questions should be done in the spaces provided in Booklet A. The reverse sides may be used for rough working. The total marks for each question are shown in brackets next to the question number. Statistical tables and formulae are presented in Booklet B. Materials permitted: Electronic calculators may be used but must not be text returnable. Dictionaries are not permitted. Students may take in one A4 sheet of paper hand written on one side only. This sheet must be handed in with your examination paper by placing it inside Booklet A.
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Total
6 18 14 30 9 15 10 8 10 120
Please note that only brief solutions are provided for some parts of
this exam paper
FEV (forced expiratory volume) is the volume of air that can be exhaled after taking a deep breath and is an important measure of pulmonary (lung) function. FEV1 is the forced expiratory volume exhaled in the first second. Researchers surveyed 507 Australian children aged 8 -16 to determine whether they were smokers or non-smokers. Among these, 59 children reported that they were current smokers. These 59 children were selected for a study of lung function using FEV. Another 59 children were selected randomly from those who reported being non-smokers and these too were included in the study. The following variables were recorded for these 118 children: ID number Identification number of child Age Age of child in years FEV1 Volume of air exhaled in the first second after a deep breath (litres) FEV1_new Volume of air exhaled in the first second after a deep breath,
following a one month exercise program Height Height of child in centimetres Sex Sex of the child 1 = male, 2 = female Smoker Reported smoking status of child
0 = non-smoker, 1 = smoker Parents Smoking status of parents 0 = neither parent smokes
1 = one parent smokes 2 = both parents smoke
Source: Tager, I.B., et al (1979) Effect of parental cigarette smoking on pulmonary function in children. American Journal of Epidemiology (adapted) Question 1 (6 marks)
a) Among other questions, researchers wanted to determine whether smoking had an effect on a child's FEV measurement. Explain why the sample was selected as outlined above rather than selecting 118 children...