Test Your Programming Skills with Safcode!

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Here is all important interview / exams questions.
Student doing practice apptitude test on safcode platform.
Instruction: "Total Number of Questions: 20
Each question carry 10 mark , no negative marking"

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Quiz Start

1. The lapply() function takes ___________, ____________ and __________ as input. Data Frame, Array
None of them
List, Vector and Data Frame
Array, List, Matrix

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2. The estimate of any population is called ___________ Guess
Statistics
Subset
Sampling

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3. How to visualize data in Pie Chart? piechart
package
pipe
pie

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4. The __________ function is used to group data frame. List()
matrix()
group_by()
summerize()

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5. What is the function used to read CSV files into R? csv()
readfile()
read_csv()
read()

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6. Response variable is represented on ___________ y-axis
x-axis
none of them
both x-axis and y-axis

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7. The __________ function is used to sort the values of column in ascending or descending order. arrange()
manage()
mutate()
sort()

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8. Heavy data ranging from petabytes or exabytes is called ___________. Big Data
Heavy Data
Large Data
Huge Data

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9. Which function is used to add regression line to the scatter plot. smooth()
None of them
abline()
abs_line()

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10. How to installed packages in R? Install.packages(packagenames)
require(packagename)
Library(packagename)
install(packagename)

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