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. Response variable is represented on _______________ no axis
y-axis
x-axis
both x-axis and y-axis

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

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3. The vertical dashed lines in the boxplot are known as ______________. Notches
Outliers
Tails
Whiskers

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4. which function converts list to a vector? de_list()
cnvert_list()
unlist()
none of them

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

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6. How are null entries in a data frame denoted in R? n/a
na
None of these
NaN

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7. __________ is used to plot scatter plot of two variables in accordance with the third variable. Heatmap
None of these
Coplot
Violin graph

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

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9. The lapply() function return ___________ as output. Data frame
Array
Vector
List

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

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

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12. Which function is used to add labels to the graph in the ggplot() function. label()
labs()
lab()
All of them

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13. When the explanatory variable is categorical, then _____________ graph is used. scatter plot
None of these
box plot
pie chart

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14. __________ is the first step of data science life cycle. Model Deployment
Business Understanding
Data Acquisition
Data Modeling

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15. ____________ is the raw collection of records, contents and images. Matrix
Data
Tables
Data frame

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

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

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

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

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20. ___________ is called the positional average of any data. mean
median
mode
quartiles

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