D-DS-FN-23無料問題集「EMC Dell Data Scientist and Big Data Analytics Foundations 2023」

質問 1

Consider this SQL statement:
SELECT product, prod_cost, avg(prod_cost) OVER (PARTITION BY product)
FROM product_detail
The OVER clause makes this what type of function?

（A）Window function

（B）System function

（C）User-defined function

（D）Aggregate function

正解：A 解答を投票する

質問 2

Consider these itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?

（A）75%

（B）60%

（C）66%

（D）80%

正解：A 解答を投票する

質問 3

A data scientist wants to add a new categorical variable, X2, into a Linear Regression model Y=b0+b1*X1.
How many terms should be added to the right-hand side of the equation if X2 has four possible values?

（A）3

（B）5

（C）4

（D）2

正解：A 解答を投票する

質問 4

The web analytics team uses Hadoop to process access logs. They now want to correlate this data with structured user data residing in their massively parallel database.
Which tool should they use to export the structured data from Hadoop?

（A）Chukwa

（B）Scribe

（C）Pig

（D）Sqoop

正解：D 解答を投票する

質問 5

You have been assigned to perform a study of the daily revenue effect of a pricing model of online transactions. When is the analytics lifecycle considered completed?

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

（B）When a model has been completely developed based on both a sample of the data and the entire set of data available.

（C）When written documentation has been produced and the code has been handed off to the DBA/operations.

（D）When a model has been completely developed and the results have shown statistically acceptable results.

正解：C 解答を投票する

質問 6

In linear regression, what indicates that an estimated coefficient is significantly different than zero?

（A）A small p-value

（B）R-squared near 0

（C）R-squared near 1

（D）The estimated coefficient is greater than 3

正解：A 解答を投票する

質問 7

In text analysis, what makes the corpus representation dynamic?

（A）Inherent high dimensionality in the problem of text analysis

（B）Requirement to update index and corpus metrics continuously

（C）Algorithms used to determine the classification or tagging

（D）Search and retrieval process for finding the document that meets the search criteria

正解：B 解答を投票する

質問 8

What is one modeling or descriptive statistical function in MADlib that is typically not provided in a standard relational database?

（A）Quantiles

（B）Linear regression

（C）Variance

（D）Expected value

正解：B 解答を投票する

質問 9

What is required in a presentation for business analysts?

（A）Detailed statistical explanation of the applicable modeling theory

（B）Budgetary considerations and requests

（C）The presentation author's credentials

（D）Operational process changes

正解：D 解答を投票する

質問 10

What are the characteristics of Big Data?

（A）Data volume, processing complexity, and data structure variety.

（B）Data volume, business importance, and data structure variety.

（C）Data volume, processing complexity, and business importance.

（D）Data type, processing complexity, and data structure variety.

正解：A 解答を投票する

質問 11

The R vector "v" contains 16 elements.
Which R command modifies the vector to have the same elements in reverse order?

（A）v <- v[16:1]

（B）v <- v[16, 1]

（C）v[16:1] <- v[16:1]

（D）v[1,16] <- v[16:1]

正解：A 解答を投票する

質問 12

What are two data categories that represent quantitative data?

（A）Ordinal and interval

（B）Nominal and ordinal

（C）Ratio and interval

（D）Nominal and ratio

正解：C 解答を投票する

質問 13

There are three criterions for big data analytics projects which include:
- Decision speed
- Analysis flexibility
What is the additional criteria?

（A）Security

（B）Quality

（C）Throughput

（D）Structure

正解：C 解答を投票する

質問 14

The Marketing department of your company wishes to track opinion on a new product that was recently introduced. Marketing would like to know how many positive and negative reviews are appearing over a given period and potentially retrieve each review for more in- depth insight.
They have identified several popular product review blogs that historically have published thousands of user reviews of your company's products. You have been asked to provide the desired analysis.
You examine the RSS feeds for each blog and determine which fields are relevant. You then craft a regular expression to match your new product's name and extract the relevant text from each matching review.
What is the next step you should take?

（A）Use the extracted text and your regular expression to perform a sentiment analysis based on mentions of the new product

（B）Read the extracted text for each review and manually tabulate the results

（C）Group the reviews using Naïve Bayesian classification

（D）Convert the extracted text into a suitable document representation and index into a review corpus

正解：D 解答を投票する

質問 15

Which word or phrase completes the statement? A Data Scientist would consider that a RDBMS is to a Table as R is to a ________.

（A）List

（B）Array

（C）Data frame

（D）Matrix

正解：C 解答を投票する

D-DS-FN-23 無料問題集「EMC Dell Data Scientist and Big Data Analytics Foundations 2023」

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