Quiz 03: 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.

1.4: Git and GitHub

  • How does GitHub differ from Git?
  • What are the different statuses files can take?
  • What is a “diff”?
  • Why is staging required before committing?
  • How are commits different than pushes?
  • What is the difference between a push and a pull? How do these actions allow for collaboration?
  • What happens if an error occurs when pushing? How about pulling?

2.1: Navigating Data

  • How can you get help in R?
  • Describe the different forms of data.
  • What is Domain Knowledge? Why is it relevant to analyzing data?
  • Why do statisticians use different words to describe data than computer scientists?
  • What are the different ways to subset structured data? Why does R allow subsetting to work in this manner?
  • Why should we look at the data’s structure after we import a data file?
  • What kinds of commands should be run to verify how R is representing data?

2.2: Importing Data

  • How is RAM different than an HD/SSD? How is it similiar?
  • Where is data stored long term? Where is data stored short term?
  • Why is the standard advice when working with big data in R to buy more RAM?
  • What is the difference between a byte and bit?
  • Why are there two variants of CSVs? Is there any hierarchy associated with reading in flat files?
  • How are R’s rda and rds similar? How are they different?
  • What does the function rm() do? Why is this useful?
  • Why should we disable workspace saving?
  • Considering the different kinds of binary file formats, what is the most popular way to save data?
  • When should binary files be used over flat files and vice versa?

Materials Provided

Students will have access to:

Materials Needed

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


  • 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.


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 three other resources that may assist your studies:

  • Topic Outline (Above)
  • Lecture Code
  • Homework

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.

Consider using resources such as:

  1. RStudio Cloud Primers for interactive practice.
  2. Exercise problems listed in a given section of the readings.

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?


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.