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

CS109 Midterm
Tue July 25th, 7pm

Logistics

The CS109 midterm is a 2-hour, closed book, closed calculator/computer exam. You are, however, allowed to bring 2 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 July 25th, 7-9pm

Where: We have reserved room 370-370.

Alternative Arrangements

In the rare case that you can't make the 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 a reasonable time from 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 July 19th. In the reader this corresponds to Part 1 and Part 2, and Part 3 up to (not including) 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

You can do it!