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

質問 1

A data scientist plans to classify the sentiment polarity of 10, 000 product reviews collected from the Internet.
What is the most appropriate model to use? Suppose labeled training data is available.

（A）K-means clustering

（B）Linear regression

（C）Logistic regression

（D）Naïve Bayesian classifier

正解：D 解答を投票する

質問 2

MapReduce is designed to process data in which way?

（A）A few large files split into blocks processed serially on one machine

（B）Many small files processed in parallel across multiple machines

（C）A few large files split into blocks processed in parallel across multiple machines

（D）Many small files processed serially on one machine

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 3

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

質問 4

What is a business driver for Big Data analytics adoption?

（A）Ensure the analysts work in isolation

（B）Identify new business opportunities

（C）Maintain existing data silos

（D）Implement the latest technology and tools

正解：B 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 5

Refer to the exhibit.

You are assigned to do an end of the year sales analysis of 1, 000 different products, based on the transaction table.
Which column in the end of year report requires the use of a window function?

（A）Total Sales to Date

（B）Daily Sales

（C）Maximum Price

（D）Average Daily Price

正解：A 解答を投票する

質問 6

Consider a database with the following four transactions:
Transaction 1: {cheese, bread, milk}
Transaction 2: {soda, bread, milk}
Transaction 3: {cheese, bread}
Transaction 4: {cheese, soda, juice}
Assuming a minimum support of 50%, which itemsets would be generated in the second step of the Apriori algorithm?

（A）{cheese, bread}, {bread, milk}

（B）{cheese, bread}, {cheese, bread, milk}

（C）{cheese}, {bread}, {milk}, {soda}

（D）{cheese, bread}, {cheese, milk}, {bread, milk}

正解：A 解答を投票する

質問 7

A logistic regression model is built to determine the probability of a credit card borrower defaulting on a credit loan. A threshold value of 0.3 is selected. Which statement can be used to predict a borrower will default?

（A）If probability < 0.3, then predict the borrower will default

（B）If probability > 0.3, then predict the borrower will default

（C）If probability > 0.1, then predict the borrower will default

（D）If probability < 0.1, then predict the borrower will default

正解：B 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 8

Which SQL OLAP grouping extension returns a result for each output row with 1 identifying a summary row and 0 identifying grouped rows?

（A）GROUP ID

（B）ROLLUP

（C）CUBE

（D）GROUPING

正解：D 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

Consider the example of an analysis for fraud detection on credit card usage. You will need to ensure higher-risk transactions that may indicate fraudulent credit card activity are retained in your data for analysis, and not dropped as outliers during pre-processing.
What will be your approach for loading data into the analytical sandbox for this analysis?

（A）EDW

（B）ETL

（C）ELT

（D）OLTP

正解：C 解答を投票する

質問 10

You have plotted the distribution of savings account sizes for a bank.

Based on the distribution shown in the exhibit, how would you proceed?

（A）Accounts of sizes greater than 2,500 are rare and are most likely outliers. Eliminate them from future analysis.

（B）Data is extremely skewed but looks bimodal. Replot the data in the range 2,500 - 10,000 to be certain.

（C）Data is extremely skewed. Replot the data on a logarithmic scale to get a better understanding of it.

（D）Data is extremely skewed. Split the analysis into two cohorts; accounts less than 2,500 and accounts greater than 2,500.

正解：C 解答を投票する

質問 11

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 12

What does the Receiver Operating Characteristic (ROC) curve show?

（A）Relationship between p-value and true positive rate

（B）Relationship between true positive rate and true negative rate

（C）Relationship between true positive rate and false positive rate

（D）Relationship between p-value and true negative rate

正解：C 解答を投票する

質問 13

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

質問 14

Consider the following itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
If the minimum support is 50%, what represents the complete list of frequent 2-itemsets?

（A）(hat, scarf), (hat, gloves)

（B）(scarf, gloves), (scarf, coat) (hat, gloves)

（C）(hat, scarf), (hat, gloves), (scarf, gloves), (scarf, coat)

（D）(hat, scarf), (scarf, coat), (coat, gloves)

正解：C 解答を投票する

質問 15

Your organization has a website where visitors randomly receive one of two coupons. It is also possible that visitors to the website will not receive a coupon.
You have been asked to determine if offering a coupon to visitors to your website has any impact on their purchase decision.
Which analysis method should you use?

（A）K-means clustering

（B）One-way ANOVA

（C）Student T-test

（D）Association rules

正解：B 解答を投票する

質問 16

Data visualization is used in the final presentation of an analytics project.
For what else is this technique commonly used?

（A）Descriptive statistics

（B）Model selection

（C）Assessing data quality

（D）ETLT

正解：C 解答を投票する

質問 17

You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters.
When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters.
What should you do?

（A）Remove one of the measures

（B）Increase the number of clusters

（C）Identify additional measures to add to the analysis

（D）Decrease the number of clusters

正解：D 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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