Quiz 05: Policies and Information

Location, Date, and Time

Conflicts: There will be no conflict quiz as students are able to choose the time and date of their quiz.

Quiz Content

All quizzes are cumulative. Previous material can reappear on a later quiz.

3.4: Bootstrap

  • When should bootstrapping be used?
  • What are the different types of bootstrapping? How does the underlying assumptions change between types?
  • What is the strategy for implementing each type of bootstrap?
  • Why is it better to allocate a vector of NA values instead of directly specifying a specific data type to hold the bootstrapped statistics?

4.2: Grammar of Data

  • What are factors?
  • How do factors differ from a character vector?
  • Where in statistical modeling do we find factors being useful?
  • Why is stringsAsFactors = TRUE by default?
  • What is the meaning of an ordered factor?
  • How can we phrase questions that prompt effective wrangling of data?
  • Describe the five verbs related to data manipulation.
  • How efficient is dplyr relative to base R code?
  • Why is Split-Apply-Combine an effective framework for statistical computing?

4.3: Functions

  • What is a function?
  • What kinds of parameters exist?
  • How does variable scope work in terms of R functions?
  • Why should we aim to write routines in the style of a function?
  • How do other members of an open source community benefit from functions?
  • Why are assertions useful for handling problematic user input?
  • What the different modes of debugging available?
  • How does each debug mode differ?

Materials Provided

Students will have access to:

Materials Needed

  • Preferably, a rested mind and non-broken hands that can type.

Policies

  • All answers must be reasonably simplified.
  • Decimals answers must contain two significant digits.
  • Grading will be done as follows:
    • A correct answer will receive all points.
    • An incorrect answer will receive proportionally appropriate partial credit.

If you have a technical issue while answering questions or need assistance with opening or starting the quiz, please alert the proctor.

Do not leave the CBTF without filing an issue with the proctor if something goes wrong.

DRES

Have a testing accommodation? Please see how the CBTF handles Letters of Accommodation.

The short version: Please bring a copy of the Letter of Accommodation to the CBTF Proctors prior to the test taking place.

Academic Integrity

In short, don’t cheat. Keep your eyes on your own quiz. Do not discuss the quiz with your friends after you have taken it. Any violation will be punished as harshly as possible.

Advice for Studying

The best way to study for a STAT 385 quiz is by writing and reading code. Try to take an idea in STAT 385 and apply it to your own work.

With this being said, there are four other resources that may assist your studies:

  • Topic Outline (Above)
  • Lecture Code
  • Homework
  • Practice Midterm Questions

Again, the best way to study is to do programming in some fashion. Whether that be writing code or explaining how code works to someone else.

Do not spend time memorizing lecture slides. You will not see any verbatim questions.

Do not try pulling an all-nighter. You can schedule your quiz anytime between a time window. To program efficiently, you need sleep despite the quote:

“Programmers are an organism that turns caffeine into code.”

Frequently Asked Questions

What kind of question types are on the quiz?

There are generally four types of problems:

  • True / False
  • Multiple Selection (e.g. select ALL correct answers from a list)
  • Fill in the blank
  • Writing Code

How many problems are on the quiz?

Only one question with 15012391 subquestions. In all seriousness, do not fixate on a number. There will be a reasonable amount of questions for the time period.

How long will it take to do the quiz?

Depending on your background, the quiz may take:

  • Prior R in-depth experience: 25 minutes
  • Some R experience: 35 minutes
  • No R experience: 50 minutes

Avoid fixating on time. Life will come and go more quickly than you realize. Focus more on the content.

When will the quiz be returned?

As all problems are automatically graded, we should be able to post the quiz results after the examination window closes.

Will the quiz be curved?

No.

We got our grades back, now will the quiz be curved?

No. Curving is only done sparingly at the end of the semester. Individual assignments are not modified.