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A Learning Portal from Recruitment India
A Learning Portal from Recruitment India
Data science is the process of diverse set of data through ?
processing data
organizing data
analysing data
All of the above
Answer with explanation
Answer: Option DExplanation
Explanation: Data science is the process of deriving knowledge and insights from a huge and diverse set of data through organizing, processing and analysing the data.
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Which of the following tool is used for constructing confidence intervals and calculating standard errors for difficult statistics?
baggyer
bootstrap
jacknife
none of the mentioned
Answer with explanation
Answer: Option BExplanation
The bootstrap procedure follows from the so called bootstrap principle
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Which of the following is incorrect with respect to use of Poisson distribution?
Modeling event/time data
Modeling bounded count data
Modeling contingency tables
All of the mentioned
Answer with explanation
Answer: Option BExplanation
Poisson distribution is used for modeling unbounded count data.
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Which of the following random variable that take on only a countable number of possibilities?
Discrete
Non Discrete
Continuous
All of the mentioned
Answer with explanation
Answer: Option AExplanation
Continuous random variable can take any value on some subset of the real line
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Which of the following graph can be used for simple summarization of data?
Scatterplot
Overlaying
Barplot
All of the mentioned
Answer with explanation
Answer: Option CExplanation
A bar chart or bar graph is a chart that presents Grouped data with rectangular bars with lengths proportional to the values that they represent.
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Which of the following is required by K-means clustering?
defined distance metric
number of clusters
initial guess as to cluster centroids
all of the mentioned
Answer with explanation
Answer: Option DExplanation
K-means clustering follows partitioning approach.
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Which of the following is an example of graphics device?
SVG
JPEG
All of the mentioned
Answer with explanation
Answer: Option DExplanation
When the plot() function is invoked, R sends the data corresponding to the plot over, and the graphics device generates the plot.
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Which of the following function is used for searching text strings by means of regular expression?
grepd
grepl
gepexpr
all of the mentioned
Answer with explanation
Answer: Option BExplanation
grep, grepl, regexpr, gregexpr and regexec search for matches to argument pattern within each element of a character vector.
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Which of the following function is used for casting data frames
dcast
ucast
rcast
all of the mentioned
Answer with explanation
Answer: Option AExplanation
Use acast or dcast depending on whether you want vector/matrix/array output or data frame output.
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Which of the following can be used to view all the tables in memory?
table
alltable
tables
None of the Mentioned
Answer with explanation
Answer: Option CExplanation
The table function is a very basic, but essential, function to master while performing interactive data analyses.
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Which of the following input can be accepted by DataFrame?
Structured ndarray
Series
DataFrame
All of the mentioned
Answer with explanation
Answer: Option DExplanation
DataFrame is a 2-dimensional labeled data structure with columns of potentially different types.
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Which of the following specifies the required minimum number of observations for each column pair in order to have a valid result?
max_periods
min_periods
minimum_periods
all of the mentioned
Answer with explanation
Answer: Option BExplanation
DataFrame.cov also supports an optional min_periods.
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Which of the following method can be used to rename categorical data?
Categorical.rename_categories()
Categorical.rename()
Categorical.mv_categories()
None of the mentioned
Answer with explanation
Answer: Option AExplanation
Renaming categories is done by assigning new values to the Series.cat.categories property.
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Which of the following is characteristic of Processed Data?
Data is not ready for analysis
All steps should be noted
Hard to use for data analysis
None of the mentioned
Answer with explanation
Answer: Option BExplanation
Processing includes merging, summarizing and subsetting data.
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Which of the following operation works with the same syntax as the analogous dict operations?
Getting columns
Setting columns
Deleting columns
All of the mentioned
Answer with explanation
Answer: Option DExplanation
You can treat a DataFrame semantically like a dict of like-indexed Series objects.
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Point out the wrong combination with regards to kind keyword for graph plotting
‘scatter’ for scatter plots
‘kde’ for hexagonal bin plots
‘pie’ for pie plots
none of the mentioned
Answer with explanation
Answer: Option BExplanation
kde is used for density plots.
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Which of the following scalars can be converted to other ‘frequencies’ by typing to a specific timedelta type?
Timedelta Series
TimedeltaIndex
Timedelta
All of the mentioned
Answer with explanation
Answer: Option DExplanation
These operations yield Series and propagate NaT -> nan.
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Which of the following function is for a single checkbox widget?
checkboxInput
dateInput
singleboxInput
all of the mentioned
Answer with explanation
Answer: Option AExplanation
Shiny comes with a family of pre-built widgets, each created with a transparently named R function.
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