Exam (elaborations)

ST 308 Quiz 1 | Questions and Answers

0 purchase

Course
ST 308

Institution
ST 308

ST 308 Quiz 1 | Questions and Answers What is the purpose of the R console? The console is where... a.) code is submitted to be evaluated b.) you can locate plots that have been created c.) you easily write code to save for later use d.) the help file associated with an R function appears What is...

[Show more]

Preview 2 out of 9 pages

View example

Uploaded on September 3, 2024
Number of pages 9
Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

st 308 quiz 1
st 308
what is the purpose of the r console the console

Institution ST 308
Course ST 308

Jumuja Member since 3 year 462 documents sold

$15.99

Add to cart

Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

ST 308 Quiz 1

What is the purpose of the R console? The console is where...

a.) code is submitted to be evaluated
b.) you can locate plots that have been created
c.) you easily write code to save for later use
d.) the help file associated with an R function appears

What is the syntax used to store the output of some code in an R object? (Just write the
symbol(s) needed and nothing else.)
<- or =

Suppose you ran the code below:

my_sum <- sum(c(1:10))
my_sum

True of False: Each time you submit my_sum in the console, R has to execute the sum
function.
False

What functions help us to understand an R object we may be working with?

str
plot
class
summary
typeof

Note: We are about to jump into R and write some code! We talk about 'comments'
there. A comment in a programming language is text that will be ignored when sent to
the console (allowing you to write notes to yourself).

In R, the # sign starts a comment.

#Here I'll find the mean mean(iris$Sepal.Length)

If these two lines are submitted to the console, the first is ignored!

Just pick True for the answer to this question.
True

, There is a built-in R object called (note that R is case-sensitive):
letters

What is the class of the letters object?

Simply give the name of the class as your answer (case sensitive, no quotes). For
instance, if the answer is the "plot", simply answer:
plot
Character

Suppose you ran the code below:

final_answer <- log(2.14.6/1.9) - 2exp(4)
final_answer

TRUE or FALSE: Each time you type final_answer into the console, R has to execute
the log and exp functions.
False

What is the name of the R function we discussed that will compactly display the internal
structure of an R object?

Simply give the name of the function as your answer (case sensitive). For instance, if
the answer is the 'hist' function, simply answer:
hist
Str

In the above console, type print(cars) on one line and print(exp) on another. Submit the
code.

Why does print(cars) produce a different type of output than print(exp)?

a. the cars object was loaded in from an external file
b. R doesn't know how to print every type of object
c. R is determining how to use print() based on the type of object used as the input
d. R is running into an error

mtcars is a built in data set in R. You can obtain the column names of a data frame
using the names() function.

True or false: gear is one of the columns.

Select one:
True
False

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Jumuja. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $15.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69411 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling

Exam (elaborations)

ST 308 Quiz 1 | Questions and Answers

Document information

Subjects

Written for

Seller

Reviews received

Content preview