D-DS-FN-23無料問題集「EMC Dell Data Science Foundations」

質問 1

You are assigned the task of creating customer profiles for your company. In your database, you have
25 key input variables that come together to define 2,500 customers. You decide to run a K-means cluster analysis on the 25 input variables based on k=4 to build your profiles.
Your analysis resulted in four cluster populations:
Cluster A=1,000 customers
Cluster B=560 customers
Cluster C=925 customers
Cluster D=15 customers
What should be attempted first to more evenly distribute the customer population across clusters?

（A）Increase K from 4 to 5

（B）Remove the 15 customers in Cluster D from the population

（C）Remove some of the input variables from the analysis

（D）Reduce K from 4 to 3

正解：D 解答を投票する

質問 2

In time series analysis, what is an indication of a stationary sequence?

（A）Decreasing trend

（B）Increasing trend

（C）Seasonality

（D）Constant variance

正解：D 解答を投票する

質問 3

In which lifecycle stage are appropriate analytical techniques determined?

（A）Model building

（B）Discovery

（C）Model planning

（D）Data preparation

正解：C 解答を投票する

質問 4

Which word or phrase completes the statement? A data warehouse is to a centralized database for reporting as an analytic sandbox is to a _______?

（A）Collection of low-volume databases

（B）Collection of data assets for ETL

（C）Collection of data assets for modeling

（D）Centralized database of KPIs

正解：C 解答を投票する

質問 5

When would you use a Wilcoxson Rank Sum test?

（A）When the data cannot easily be sorted

（B）When the populations represent the sums of other values

（C）When the data can easily be sorted

（D）When you cannot make an assumption about the distribution of the populations

正解：D 解答を投票する

質問 6

Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?

（A）Define the process to maintain the model

（B）Try different analytical techniques

（C）Transform existing variables

（D）Try different variables

正解：A 解答を投票する

質問 7

In the Map Reduce framework, what is the purpose of the Reduce function?

（A）It distributes the input to multiple nodes for processing

（B）It aggregates the results of the Map function and generates processed output

（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

正解：B 解答を投票する

質問 8

Which component of a final presentation provides a succinct overview of the business situation that was the impetus to initiate the project?

（A）Model description

（B）Approach

（C）Project goals

（D）Recommendations

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 9

You have been assigned to do a study of the daily revenue effect of apricing model of online transactions.
When have you completed the analytics lifecycle?

（A）You have presented the results of the model to both the internal analytics team and the business owner of the project.

（B）You have a completely developed model, and the results have shown statistically acceptable results.

（C）You have written documentation, and the code has been handed off to the Data Base Administrator and business operations.

（D）You have a completely developed model based on both a sample of the data and the entire set of data available.

正解：C 解答を投票する

質問 10

What action occurs during feature selection in the model building phase of the data analytics lifecycle?

（A）Overfit the model to improve prediction accuracy

（B）Create new combinations of attributes

（C）Identify the most useful input variables

（D）Select a superset of variables to shorten training times

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 11

Which data asset is an example of quasi-structured data?

（A）Webserver log

（B）XML data file

（C）Database table

（D）News article

正解：A 解答を投票する

D-DS-FN-23 無料問題集「EMC Dell Data Science Foundations」

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