Practice Free D-DS-FN-23 Exam Online Questions
Which SQL OLAP grouping extension returns a result for each output row with 1 identifying a summary row and 0 identifying grouped rows?
- A . CUBE
- B . GROUPING
- C . GROUP ID
- D . ROLLUP
What is the similarity between the matrix and array data structures in R?
- A . Both structures can contain only integers
- B . Both structures can only contain one data type
- C . Both structures can store multiple data types
- D . Both structures must be 2-dimensional
What is the similarity between the matrix and array data structures in R?
- A . Both structures can contain only integers
- B . Both structures can only contain one data type
- C . Both structures can store multiple data types
- D . Both structures must be 2-dimensional
What is the similarity between the matrix and array data structures in R?
- A . Both structures can contain only integers
- B . Both structures can only contain one data type
- C . Both structures can store multiple data types
- D . Both structures must be 2-dimensional
In hypothesis testing, when does a Type I error occur?
- A . Null hypothesis is rejected when it is actually false
- B . Null hypothesis is rejected when it is actually true
- C . Null hypothesis is accepted when it is actually false
- D . Null hypothesis is accepted when it is actually true
In the Map Reduce framework, what is the purpose of the Reduce function?
- A . It aggregates the results of the Map function and generates processed output
- B . It distributes the input to multiple nodes for processing
- C . It writes the output of the Map function to storage
- D . It breaks the input into smaller components and distributes to other nodes in the cluster
In addition to the business question and descriptions of available data sets, what else would an analytic plan include?
- A . Existing solutions to the business question
- B . Access credentials to database and/or Hadoop cluster
- C . Initial hypotheses
- D . Relevant statistical tests
In R, functions like plot() and hist() are known as what?
- A . generic functions
- B . virtual methods
- C . virtual functions
- D . generic methods
Before you build an ARMA model, how can you tell if your time series is weakly stationary?
- A . There appears to be a constant variance around a constant mean.
- B . The mean of the series is close to 0.
- C . The series is normally distributed.
- D . There appears to be no apparent trend component.
What is the primary function of the NameNode in Hadoop?
- A . Keeps track of which MapReduce jobs have been assigned to each TaskTracker
- B . Monitors the state of each JobTracker node and signals an event if unavailable
- C . Runs some number of mapping tasks against its assigned data
- D . Acts as a regulator/resolver among clients and DataNodes