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# Machine Learning Written Problems Week 1

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EECS 440: Machine Learning Written Problems Week 1
General Instructions: Write or type your answers neatly and remember to show all relevant work. All
questions are worth 10 points. Each answer should be a separate pdf, and you can turn in the pdfs on
canvas in the appropriate assignment. Some questions may be very challenging; significant partial credit
is available for reasonable attempts at solutions. Since each question is worth the same number of points,
do not waste too much time on any one. Ask me or the TAs for help if stuck.
Some of the questions require you to write short programs to simulate things. You can use any
language/software to do this, and you do not need to turn in your code.
Upload your answers to Canvas as a pdf file by 11:59pm on the due date specified after the question. You
will receive a 10% bonus for a solution turned in a week or more in advance of the due date. You can use
one late day each week (up to Saturday 11:59pm) with a penalty of 20%. Submissions after Saturday
11:59pm for any week will not be graded.
Each group must do their own work. Only one submission is needed from each group. Do not use any
source other than the lecture notes, textbook(s) and readings on the class website to answer these
questions. Only those who contributed equally to a submission should have their names and Case IDs on
the submission. Those not listed as contributing will not receive points.
1. For three random variables A, B and C, show with a counterexample that the statement “A
is independent of B” does not imply the statement “A is independent of B given C.”
(9/11)
2. Points are sampled uniformly at random from the interval (0,1)2 so that they lie on the
line x+y=1. Determine the expected squared distance between any two sampled points.
(9/11)
3. Describe two learning tasks that might be suitable for machine learning approaches. For
each task, write down the goal, a possible performance measure, what examples you
might get and what a suitable hypothesis space might be. What learning setting
(supervised, unsupervised, etc.) seems most appropriate for each task? What example