Analyzing Car Data

Which function is used to read data from a text file in R?

read.table (correct)

read.xlsx

read.json

read.csv

What is the default value for the `header` argument in the `read.csv` function?

FALSE

NA

TRUE (correct)

NULL

Which function is used to view the first 6 rows of a data frame in R?

tail()

head() (correct)

names()

dim()

What does the `dim()` function in R return?

Both number of rows and number of columns Signup and view all the answers

Which function is used to create a vector in R?

c() Signup and view all the answers

What does the length() function return?

The number of values in a vector Signup and view all the answers

How do you access items in a matrix using index numbers?

Using [] brackets Signup and view all the answers

Which function is used to add columns to a matrix in R?

cbind() Signup and view all the answers

Which function can be used to export data as a text file in R?

write.table Signup and view all the answers

What is the most convenient and standard representation for data analysis in R?

Tabular representation Signup and view all the answers

Which of the following is an example of qualitative data?

The grades of students Signup and view all the answers

Which data structure is commonly used in R for organizing tabular data?

Data frame Signup and view all the answers

What is the difference between ordinal and nominal data?

Ordinal data can be ordered, while nominal data cannot be ordered Signup and view all the answers

What types of features/attributes are important to recognize in tabular data?

Qualitative vs. quantitative Signup and view all the answers

Which of the following is an example of continuous data?

The average mark of a student Signup and view all the answers

What are the possible categories for binary data?

1, 0 Signup and view all the answers

Which function is used to create a factor in R?

factor() Signup and view all the answers

Which function is used to access items in a data frame column in R?

rbind() Signup and view all the answers

What is the purpose of the summary() function in R?

To summarise the data in a data frame Signup and view all the answers

What is the correct way to remove the first row and column from a data frame in R?

data_frame[-c(1), -c(1)] Signup and view all the answers

Which of the following is a valid object name in R?

object name Signup and view all the answers

What is the data type of the object 'x' after executing the code 'x <- 5.5' in R?

numeric Signup and view all the answers

Which R data structure is used to store a list of items of the same type?

Vectors Signup and view all the answers

What does the function 'str(dat)' do in R?

Displays the structure of data, type, and data in each column Signup and view all the answers

Which type of attribute can be split further into two types: symmetric or asymmetric based on whether or not their values are equally informative?

Binary attributes Signup and view all the answers

Which type of attribute can be split into two types: interval and ratio?

Quantitative attributes Signup and view all the answers

Which type of attribute can be split into discrete and continuous ones?

Quantitative attributes Signup and view all the answers

Which operations can be applied to every type of attribute except nominal?

Comparison (= and 6=) Signup and view all the answers

Which operations can be applied to only ratio attributes?

Division (/) and multiplication (x,.) Signup and view all the answers

Which operations may also be inapplicable for some attributes?

Differences (-) and addition (+) Signup and view all the answers

Which function is used to check the data type of an object in R?

typeof() Signup and view all the answers

What is the data type of the object 'hp' in the given data frame?

integer Signup and view all the answers

Which R data structure is commonly used for organizing tabular data?

Data Frames Signup and view all the answers

What is the purpose of the summary() function in R?

To provide summary statistics Signup and view all the answers

Which of the following is an example of quantitative data?

Continuous 3.3 Signup and view all the answers

What is the difference between ordinal and nominal data?

Ordinal data can be meaningfully ordered, while nominal data doesn't have any order Signup and view all the answers

Which of the following is an example of binary data?

Binary value (1, 0) Signup and view all the answers

Which type of attribute can be split into two types: interval and ratio?

Numeric Signup and view all the answers

Which function is used to import data from a CSV file in R?

read.csv Signup and view all the answers

What is the purpose of the `names()` function in R?

To show the names of the columns in a data frame Signup and view all the answers

Which function is used to check the class of each column in a data frame in R?

sapply() Signup and view all the answers

What does the `dim()` function in R return?

The dimensions of a data frame (number of rows and number of columns) Signup and view all the answers

Which function is used to create a vector in R?

rep() Signup and view all the answers

Which function is used to access items in a data frame column in R?

[] Signup and view all the answers

What does the length() function return in R?

The number of values in a vector Signup and view all the answers

What does the dim() function in R return?

The number of rows and columns in a matrix Signup and view all the answers

Which function is used to create a factor in R?

factor() Signup and view all the answers

What does the `dim()` function in R return?

The number of rows and columns in a data frame Signup and view all the answers

What is the correct way to remove the first row and column from a data frame in R?

data_frame[-1, -1] Signup and view all the answers

What does the length() function return?

The number of items in a vector Signup and view all the answers

Which function is used to export data as a text file in R?

write.table Signup and view all the answers

What is the correct way to remove the first row and column from a data frame in R?

df <- df[-1, -1] Signup and view all the answers

What type of attribute can be split into two types: interval and ratio?

Numeric Signup and view all the answers

What is the purpose of the summary() function in R?

To calculate summary statistics of a data frame Signup and view all the answers

Which type of attribute can be split further into two types: symmetric or asymmetric based on whether or not their values are equally informative?

Binary attributes Signup and view all the answers

Which type of attribute can be split into two types: interval and ratio?

Quantitative attributes Signup and view all the answers

Which operations can be applied to every type of attribute except nominal?

Differences (-) and addition (+) Signup and view all the answers

What is the purpose of the summary() function in R?

To create a summary statistics table for a data frame Signup and view all the answers

Which function is used to read data from a text file in R?

read.csv() Signup and view all the answers

What does the length() function return?

The number of elements in a vector Signup and view all the answers

Analyzing Car Data

Questions and Answers

Which function is used to read data from a text file in R?

What is the default value for the header argument in the read.csv function?

Which function is used to view the first 6 rows of a data frame in R?

What does the dim() function in R return?

Which function is used to create a vector in R?

What does the length() function return?

How do you access items in a matrix using index numbers?

Which function is used to add columns to a matrix in R?

Which function can be used to export data as a text file in R?

What is the most convenient and standard representation for data analysis in R?

Which of the following is an example of qualitative data?

Which data structure is commonly used in R for organizing tabular data?

What is the difference between ordinal and nominal data?

What types of features/attributes are important to recognize in tabular data?

Which of the following is an example of continuous data?

What are the possible categories for binary data?

Which function is used to create a factor in R?

Which function is used to access items in a data frame column in R?

What is the purpose of the summary() function in R?

What is the correct way to remove the first row and column from a data frame in R?

Which of the following is a valid object name in R?

What is the data type of the object 'x' after executing the code 'x <- 5.5' in R?

Which R data structure is used to store a list of items of the same type?

What does the function 'str(dat)' do in R?

Which type of attribute can be split further into two types: symmetric or asymmetric based on whether or not their values are equally informative?

Which type of attribute can be split into two types: interval and ratio?

Which type of attribute can be split into discrete and continuous ones?

Which operations can be applied to every type of attribute except nominal?

Which operations can be applied to only ratio attributes?

Which operations may also be inapplicable for some attributes?

Which function is used to check the data type of an object in R?

What is the data type of the object 'hp' in the given data frame?

Which R data structure is commonly used for organizing tabular data?

What is the purpose of the summary() function in R?

Which of the following is an example of quantitative data?

What is the difference between ordinal and nominal data?

Which of the following is an example of binary data?

Which type of attribute can be split into two types: interval and ratio?

Which function is used to import data from a CSV file in R?

What is the purpose of the names() function in R?

Which function is used to check the class of each column in a data frame in R?

What does the dim() function in R return?

Which function is used to create a vector in R?

Which function is used to access items in a data frame column in R?

What does the length() function return in R?

What does the dim() function in R return?

Which function is used to create a factor in R?

What does the dim() function in R return?

What is the correct way to remove the first row and column from a data frame in R?

What does the length() function return?

Which function is used to export data as a text file in R?

What is the correct way to remove the first row and column from a data frame in R?

What type of attribute can be split into two types: interval and ratio?

What is the purpose of the summary() function in R?

Which type of attribute can be split further into two types: symmetric or asymmetric based on whether or not their values are equally informative?

Which type of attribute can be split into two types: interval and ratio?

Which operations can be applied to every type of attribute except nominal?

What is the purpose of the summary() function in R?

Which function is used to read data from a text file in R?

What does the length() function return?

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What is the default value for the `header` argument in the `read.csv` function?

What does the `dim()` function in R return?

What is the purpose of the `names()` function in R?

What does the `dim()` function in R return?

What does the `dim()` function in R return?