R

Question 1

R language is used for?

Answer 1

data analysis and Statistical Computing

Question 2

it is especially relevant for data science professionals due to its data cleaning, importing, and visualization capabilities.

Answer 2

R

Question 3

You can use R to create

Answer 3

graphics and charts

Question 4

What are the 2 reasons why this language is called R

Answer 4

1. R is the first letter in the inventors’ names
2. R is a play on the name of its parent language S,

Question 5

Who developed S language

Answer 5

Bell Telephone Laboratories.

Question 6

When does R language created

Answer 6

early 1990s

Question 7

Who created R language?

Answer 7

Ross Ihaka and Robert Gentleman.

Question 8

Ihaka and Gentleman are both statistics professors in what university?

Answer 8

New Zealand university

Question 9

How to print/output a text

Answer 9

Use single or double quotes.

Question 10

Print/output Numbers

Answer 10

Just type the number (without quotes)

Question 11

Print/output simple calculations’

Answer 11

just type the equation without = sign

Question 12

Can you output a code without using a print function?

Answer 12

YES

Question 13

When do you need to use the print()

Answer 13

when your code is inside an expression or inside curly brace { }

Question 14

What should we use to create a comment in R language

Answer 14

#

Question 15

Does R language have a command for declaring a variable?

Answer 15

It does not have

Question 16

<- is use for?

Answer 16

it is use to assign value to a variable

Question 17

TRUE or FALSE:

To print the variable value, just type the variable name.

Answer 17

TRUE

Question 18

When you are working with loops, what can you use to print a variable?

Answer 18

print ( ) / print function

Question 19

it is use to concatenate or join two or more elements

Answer 19

paste ( ) / paste function

Question 20

In R, we can use this to combine both text and variable

Answer 20

comma ( , )

Question 21

It can also use to add a variable to another variable

Answer 21

comma ( , )

Question 22

can you combine a string (text) and a number?

Answer 22

No

Question 23

TRUE OR FALSE:

You can’t assign the same value to multiple variables in one line.

Answer 23

FALSE

Question 24

How do we assign the same value to multiple variables?

Answer 24

variable 1 <- variable 2 <- variable 3 <- “Hello world”

Question 25

TRUE OR FALSE:

A variable name must start with a letter and can be a combination of letters, digits, period(.)

Answer 25

TRUE

Question 26

TRUE OR FALSE:

A variable name can start with a number or underscore (_)

Answer 26

FALSE

Question 27

Is Variable name in R language is case-sensitive?

Answer 27

Yes

Question 28

TRUE or FALSE:

Reserved words can be used as variables

Answer 28

FALSE

Question 29

Enumerate the Data Types in R language

Answer 29

1. Numeric
2. Integer
3. Complex
4. Character
5. Logical

Question 30

Contains any number with or without decimal

Answer 30

Numeric

Question 31

It is a Numeric data without Decimal

Answer 31

Integer

Question 32

What should we use at the end of the data type integer?

Answer 32

L

Question 33

What data type is in this form:

a + bi

Answer 33

Complex

Question 34

Also known as String

Answer 34

Character

Question 35

Also known as boolean

Answer 35

Logical

Question 36

What can we use to check the data type of a variable?

Answer 36

class ( )

Question 37

What are the 3 Number types in R?

Answer 37

Numeric
Integer
Complex

Question 38

3 Type conversion

Answer 38

as.numeric()
as.integer()
as.complex()

Question 39

OPERATORS

Answer 39

*
/

%%
%/%

Question 40

Build in math functions

Answer 40

min()
max()
sqrt()
abs()
ceiling()
floor()

Question 41

use to find the lowest number in a set

Answer 41

min()

Question 42

use to find the largest number in a set

Answer 42

max()

Question 43

Returns the square root of a number

Answer 43

sqrt()

Question 44

Returns the absolute value of a number

Answer 44

abs()

Question 45

Rounds a number upwards to its nearest integer

Answer 45

ceiling()

Question 46

Rounds a number downwards to its nearest integer

Answer 46

floor()

Question 47

Is use to find the number of characters in a string

Answer 47

nchar()

Question 48

Use to check if a character or a sequence of characters are present in a string

Answer 48

grepl()

Question 49

To merge/concatenate two strings

Answer 49

paste()

Question 50

what can we use to insert characters that are illegal in a string

Answer 50

Escape Characters

Question 51

\

Answer 51

Backslash

Question 52

\n

Answer 52

Newline

Question 53

\r

Answer 53

Carriage Return

Question 54

\t

Answer 54

Tab

Question 55

\b

Answer 55

Backspace

Question 56

ENUMERATE GRAPHICS IN R

Answer 56

Plot
Line
Scatterplot
Pie charts
bars

Question 57

what function can we use to plot a point

Answer 57

plot()

Question 58

what function can we use to create a line

Answer 58

plot ( ) & type parameter

Question 59

what function can we use to create a scatterplot

Answer 59

Plot()

Question 60

what function can we use to create a pie chart

Answer 60

pie()

Question 61

what function can we use to create a bar graph

Answer 61

barplot()