Data Analytics Quiz 1

Find the Output:

n = 5

x = rep(0,n)

for (j in 1:n)

{

x[j] = j^2

}

x

• 1 4 9 16 25

• 0 25 0 25 0

• 1 2 3 4 5

• None

What is the output?

x <- c("Jan","Feb","Mar","April","May","June","July")

y <- x[c(2,3,6)]

print(y)

• Mar Apr July

• FebMarJune

• "Feb" "Mar" "June"

• Error

Files containing R scripts ends with extension :

• .S

• .R

• .Rp

• All of the mentioned

Which of the following statement changes column name to h and f ?

• colnames(m) <- c("h", "f")

• columnnames(m) <- c("h", "f")

• rownames(m) <- c("h", "f")

• None of the mentioned

Point out the wrong statement :

• $ operator semantics are similar to that of [[

• The [[ operator can take an integer sequence if you want to extract a nested element of a list

• The $ operator can be used to extract multiple elements from a list

In R language the following are all atomic data types EXCEPT

• integer

• logical

• data frame

• character

What is the output of

x <- c(4, "a", TRUE)

class(x)

• Numeric

• Character

• Integer

• Logical

What is the output

x <- c(1,3, 5)

y <- c(3, 2, 10)

rbind(x, y)

• A vector of length 2

• A 2 by 2 matrix

• A vector of length 3

• A 2 by 3 matrix

Which of the following step is performed by data scientist after acquiring the data ?

• Data Cleansing

• Data Integration

• Data Replication

• All of the Mentioned

Point out the correct statement:

• Raw data is original source of data

• Preprocessed data is original source of data

• Raw data is the data obtained after processing steps

• None of the Mentioned