Take a short R quiz to help us test it - multiple freelancers needed!

We are developing a data science-oriented R quiz and need multiple R users to take the quiz in order to calibrate it. The quiz won't take you more 25 minutes, since that is the time limit of the quiz! I will pay up to $10 for taking this quiz based on your score. The maximum score of the quiz is 50, and each point will be worth $0.20, i.e. the final payment will be $0.20 * total score. For instance, - 25/50 points yields $5.00. - 35/50 points yields $7.00. - 50/50 points yields $10.00. All questions in the quiz are related to base R only, i.e. there are no questions on the syntax or usage of specific R packages. The quiz is made of multiple choice questions (both single-answer and multiple-answer) focused on the following topics. - General R syntax, such as operators and indexing - The usage of commonly used R functions - Data wrangling and text processing in R - Optimised code R - Low-level plotting in R - Statistical analysis functions in R We want to imitate real working conditions, so using the R console, web search or text books etc. is allowed during the quiz. Asking for advice from someone else is not though, obviously! For additional details about the quiz, check out its start page: [login to view URL] You won't be able to take the quiz until you get a Participant ID and password from me. Don't hesitate to message me if you have any questions about the project or the quiz!