Mastery Check – Basics of R
See the course material for the code to create the dataset!
Here is the data set that we are using for this R session. Simply copy and paste this into an r script and run everything. This will create a df object for you to answer the questions with. Be sure to include the set.seed function.
set.seed(1234)
ID = 1:100
length_mm = rnorm(100,30,1)+ID/5
mass_g = length_mm + rnorm(100,5,.3)
habitat_type = c(rep("Urban",30),rep("Rural",10),rep("Suburban",60))
df <- data.frame(ID,mass_g,length_mm,habitat_type)
Quiz Summary
0 of 9 Questions completed
Questions:
Information
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
Results
Results
0 of 9 Questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- Current
- Review
- Answered
- Correct
- Incorrect
-
Question 1 of 9
1. Question
When you set the working directory, what do you need to do? Select all that apply
CorrectIncorrect -
Question 2 of 9
2. Question
When you read a dataset into R, what do you need to do? Select all that apply
CorrectIncorrect -
Question 3 of 9
3. Question
Which of the following is true about the mass_g variable? Select all that apply
CorrectIncorrectHint
You can view just mass_g in your console by running the code df$mass_g
-
Question 4 of 9
4. Question
Which of the following is true about the habitat_type variable? Select all that apply
CorrectIncorrectHint
You can see just the habitat_type variable by running df$habitat_type
-
Question 5 of 9
5. Question
Running the code
df$length_mmresults in what type and class of data in the output?CorrectIncorrect -
Question 6 of 9
6. Question
What makes our dataframe df different than a matrix? Select all that apply
CorrectIncorrect -
Question 7 of 9
7. Question
What methods could we use to export our dataframe? Select all that apply
CorrectIncorrect -
Question 8 of 9
8. Question
Create a simple plot, that puts length_mm on the x-axis and mass_g on the y-axis. Labels are not necessary
plot()Which of the following is true about the plot you created? Select all that apply
CorrectIncorrect -
Question 9 of 9
9. Question
Create a simple boxplot, that puts habitat_type on the x-axis and length_mm on the y-axis. Labels are not necessary
boxplot()Which of the following is true about the plot you created? Select all that apply
CorrectIncorrectHint
the format for a boxplot is boxplot(dependent_variable ~ independent_variable)
