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MATH 203 Principles of Statistics
Midterm Exam 1
February 17, 2010
Time: 50 minutes
Instructions:
Answer all questions, show your reasoningbriefly, hand calculators are permitted, crib
sheets are NOT, and write your name and student number on your answer book.
Question 1 (10 marks):
The following data were collected by forensic pathologists on the estimated
timesin hourssince death, for 13 homicide cases.
10.2, 11.3, 8.4, 9.6, 1.1, 11.2, 8.5, 7.5, 7.2, 6.7, 1.3, 11.9, 10.4
i) Excluding the sample mode, calculate two different measures of centrality for these data.
ii) In a
single
sentence give a reason why you think one measure is to be preferred over the other in this
case.
iii) Suppose that for another set of 13 observationsgiven in minutes since deathit is found that the
sample standard deviation is 65.23 and that the sample mean is 420.65. Without doing any further
calculations is it reasonable to conclude that the second data set has much more variability than the
first? Keep your explanation brief.
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This note was uploaded on 06/23/2010 for the course MATH 203 taught by Professor Dr.josecorrea during the Spring '08 term at McGill.
 Spring '08
 Dr.JoseCorrea
 Math, Statistics

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