PROBLEM SOLVING USING R - UNIT III MCQS

In R, what values can logical variables have?

• TRUE and FALSE

• 0 and 1

• Yes and No

• On and Off

Which operator is used to test for equality in R?

• ==

• =

• !=

• <=

Which operator is used to test for inequality in R?

• !=

• <>

• ~=

• >

How can you create a character variable in R?

• char()

• create.character()

• character()

• string()

How can you concatenate two strings in R?

• concat()

• merge()

• str_c()

• str_concat()

What is the escape sequence for a newline character in R?

• \n

• \r

• \t

• \\

How can you extract a substring from a character variable in R?

• substring()

• extract()

• str_extract()

• []

What is a factor in R?

• A categorical variable

• A continuous variable

• A binary variable

• A numeric variable

How can you convert a character variable to a factor in R?

• as.factor()

• convert.factor()

• to_factor()

• make_factor()

How can you identify the unique categories in a factor variable in R?

• unique()

• distinct()

• levels()

• categories()