Quiz 07: 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.

6.1: Web Scraping

  • How is an HTTP request formed?
  • The best way to retrieve content between an html tag is to … .
  • How is content different than link attributes?
  • What kind of structure of data does HTML have?

6.2: Web APIs

  • Why should you use a Web API over Scraping content from a website?
  • What are the different components of an HTTP request?
  • Which component should always be checked prior to looking at the data?
  • How are HTTP verbs used to manipulate data in a collection?
  • Why do we need to encode special symbols inside a URL?
  • What is JSON, how is it used by web APIs, and what R data structure is it similar to?

6.3: Unstructured Data

  • Where can unstructured data be found?
  • What is the difference between a character and a string? How relevant is this to R’s representation of unstructured data?
  • What are escape characters? When should they be used?
  • How do the follow two strings differ “UPPER” vs. “upper”?
  • How can you concatenate strings together? What controls the per-element concatentation vs. entire vector concatenation?
  • When might taking a substring of the data be appropriate?

6.4: Regular Expressions

  • How can regular expressions be employed in an analysis?
  • What is the difference between a literal character and a meta character?
  • Are the following two regexes equivalent: [:alpha:] vs. [[:alpha:]]?
  • Explain the regex pattern: [^n]
  • How do groups relate to backreferences?
  • When might we not want to use greedy regex?
  • Should regex be used to work on all structures of data?

7.1: Joins

  • How is the idea of databases similar to the idea of R’s data.frame?
  • How is data connect within a database?
  • What are the different kinds of joins?

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 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?


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.