$\DeclareMathOperator{\p}{Pr}$ $\DeclareMathOperator{\P}{Pr}$ $\DeclareMathOperator{\c}{^C}$ $\DeclareMathOperator{\or}{ or}$ $\DeclareMathOperator{\and}{ and}$ $\DeclareMathOperator{\var}{Var}$ $\DeclareMathOperator{\E}{E}$ $\DeclareMathOperator{\std}{Std}$ $\DeclareMathOperator{\Ber}{Bern}$ $\DeclareMathOperator{\Bin}{Bin}$ $\DeclareMathOperator{\Poi}{Poi}$ $\DeclareMathOperator{\Uni}{Uni}$ $\DeclareMathOperator{\Exp}{Exp}$ $\DeclareMathOperator{\N}{N}$ $\DeclareMathOperator{\R}{\mathbb{R}}$ $\newcommand{\d}{\, d}$

CS109 Midterm
Tue Nov 1st, 7pm, or Wed Nov 2nd

Logistics

The CS109 midterm is a 2-hour, closed book, closed calculator/computer exam. You are, however, allowed to bring 5 pages (front and back) of notes in the exam, formatted in any way you like. Make sure to practice before the exam.

First Offering: Tue Nov 1st, 7-9pm

Where: We have reserved two rooms (370-370 and Hewlett 201). Location will be by last name.
370-370
Last Name: A through L
Hewlett 201
Last Name: M through Z

Second Offering: Wed Nov 2nd, 8-10pm

Where: Hewlett 200 Hewlett 200
Last Name: A through Z

Alternative Arrangements

Since we have two offerings, we imagine that there will be few people who can not make both times because of academic conflicts (such as having another midterm). In the rare case that you can't make either time, please email cs109@cs.stanford.edu

SCPD Monitors

If you are an SCPD student you will need an exam monitor. You should make arrangements to take the exam within 24 hours after 7p on Tuesday. The exam monitor may be remote.

Coverage

The midterm puts special emphasis on the material from the first three problem sets and the first four sections. This includes material in lecture up to and including class on Wednesday Oct 26th. In the reader this corresponds to Part 1 and Part 2, and Part 3 up through the "inference" section.

Answer Format

You are going to be solving probability questions by hand. To that extent we are not interested in numberic answers, but rather in formulaic answers. It is fine for your answers to include summations, products, factorials, exponentials, and combinations, unless the question specifically asks for a numeric quantity or closed form. Where numeric answers are required, the use of fractions is fine. You must show your work. Any explanation you provide of how you obtained your answer can potentially allow us to give you partial credit for a problem. For example, describe the distributions and parameter values you used, where appropriate.

What about the Phi table? I am not going to make you look up values from a phi table. Instead you can leave your answer in terms of phi (the CDF of the standard normal). For example $\Phi(\frac{3}{4})$ is a fine final answer. This was not the case in the past so you will see questions which ask for a numeric answer in the practice exams.

Essential Practice

Extra Practice

Note: You should not expect that a TA will know these problems in office hours (there are far too many for them to "prep" them all)

Review Sessions

One of our wonderful head TA is holding an optional midterm review 5-6pm Friday. Location TBD.

You can do it!