Statistics 231 MARK SCHEME
Please mark in RED INK and give a brief indication to the student of why you
have taken off marks when you do.
The solutions are in BOLD, everything else was
on the question sheet.
Please put your initials on top of each solution you mark so that we can trace back
if the student has questions.
Please pay particular attention to “fill in the blank” questions. Answers other than
those given may be acceptable and if it makes sense you should give the mark. If in
doubt ask.
1.
[0.5 marks for each part]
In the sentences below, fill in the blanks using either terminology
from the course or information from the description of the study and the plots in Figure
??
.
(a) The median value of Mark 1 in Section 1 is approximately
70%
.
(b) Since the Professors are interested in the question ‘does downloading the broadcast
lecture improve the students understanding?’, this problem has a
causative
aspect.
(c) A student in Section 1 is a
unit
of the study and their mark in STAT 230 is a
variate
.
It has an
ordinal
datatype because it can be ordered.
(d) From Fig.
??
(a) we see that there is a
positive OR linear OR strong
association
between the variates Mark 1 and the STAT 230 mark.
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 Spring '08
 Marsh
 Statistics, Normal Distribution, Variance, Probability theory, probability density function

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