SAFCODE

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: 10
Each question carry 10 mark , no negative marking"

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Quiz Start

1. Points more than 1.5 times the inter quartile range above the third quartile is the point of ___________. 100th percentile
75th percentile
25th percentile
50th percentile

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2. The __________ function is used to select data by its column names. all of them
retrieve()
select()
fetch()

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3. The function that is used to extract or replace substrings in a character vector in ____________ subchar()
string()
substr()
sub_string()

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

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5. Which one is not a step of Data Preparation process. Missing Values
Feature Selection
None of the Them
Remove Duplicate Entries

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6. __________ are useful when you want to display proportional makeup of a sample in presentations. Bar charts
Bubble charts
Pie charts
Scatter charts

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

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

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9. R is an__________programming language? None of above
Close Source
Open Source
GPL

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10. The layers in ggplot2 are called ___________. sheets
geoms
levels
adds on

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