2025年最新のDEA-7TT2試験解答最新版DEA-7TT2のPDF問題集をダウンロードせよ（233問題と解答) [Q75-Q100]

2025年最新のDEA-7TT2試験解答最新版Fast2test DEA-7TT2のPDF問題集をダウンロードせよ（233問題と解答)

無料2025年最新のDell EMC Certification DEA-7TT2問題集を提供しております！Fast2test

質問 # 75
Which of the following is an example of quasi-structured data?
Response:

A. Customer record table
B. Clickstream data
C. OLAP
D. OLTP

正解：B

質問 # 76
In time series analysis, what is an indication of a stationary sequence?
Response:

A. Constant variance
B. Decreasing trend
C. Increasing trend
D. Seasonality

正解：A

質問 # 77
Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?
Response:

A. Try different variables
B. Define the process to maintain the model
C. Try different analytical techniques
D. Transform existing variables

正解：C

質問 # 78
Since R factors are categorical variables, they are most closely related to which data classification level?
Response:

A. ordinal
B. ratio
C. nominal
D. interval

正解：C

質問 # 79
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?
Response:

A. EDW
B. ELT
C. OLTP
D. ETL

正解：B

質問 # 80
How is dimensionality defined in a "bag of words" document representation?
Response:

A. Frequency of repeated words in the document
B. Average number of words per sentence in the document
C. Number of unique terms in the document
D. Total number of words in the document

正解：C

質問 # 81
In which lifecycle stage are initial hypotheses formed?
Response:

A. Model building
B. Data preparation
C. Discovery
D. Model planning

正解：C

質問 # 82
A fair six-sided die is rolled. Let A denote the event that an odd number is rolled. Let C denote the event that a 1, 2, or 3 is rolled. What is the value of the conditional probability, P(C|A)?
Response:

A. 1/2
B. 1/3
C. 2/3
D. 1/4

正解：C

質問 # 83
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 (hat, scarf) => gloves?
Response:

A. 50%
B. 60%
C. 66%
D. 40%

正解：C

質問 # 84
Refer to the exhibit.

In the exhibit, the x-axis represents the derived probability of a borrower defaulting on a loan. Also in the exhibit, the pink represents borrowers that are known to have not defaulted on their loan, and the blue represents borrowers that are known to have defaulted on their loan.
Which analytical method could produce the probabilities needed to build this exhibit?
Response:

A. Association Rules
B. Linear Regression
C. Discriminant Analysis
D. Logistic Regression

正解：D

質問 # 85
You have two tables of customers in your database. Customers in cust_table_1 were sent an e-mail promotion last year, and customers in cust_table_2 received a newsletter last year.
Customers can only be entered in once per table. You want to create a table that includes all customers, and any of the communications they received last year.
Which type of join would you use for this table?
Response:

A. Left outer join
B. Inner join
C. Cross join
D. Full outer join

正解：D

質問 # 86
You need to run a hypothesis test across three normally distributed populations. Which technique should you use?
Response:

A. Welch,s t-test
B. ANOVA
C. Z-test
D. Wilcoxon rank sum test

正解：B

質問 # 87
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
Response:

A. Data scientist is to big data
B. Seasonality is to ARIMA
C. K-means is to Naive Bayes
D. Confusion matrix is to classifier

正解：D

質問 # 88
What does a leaf node represent in a decision tree?
Response:

A. Root of the decision tree
B. Decision point on a variable
C. Outcome of a test on a variable
D. Assigned class label

正解：D

質問 # 89
Refer to the exhibit.

You have scored your Naive bayesian classifier model on a hold out test data for cross validation and determined the way the samples scored and tabluated them as shown in the exhibit.
What are the Precision and Recall rate of the model?
Response:

A. Precision = 262/277 Recall = 262/288
B. Precision =262/288 Recall = 262/277
C. Precision = 277/262 Recall = 288/262
D. Precision = 288/262 Recall = 277/262

正解：A

質問 # 90
You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. When have you completed the analytics lifecycle?
Response:

A. You have a completely developed model, and the results have shown statistically acceptable results.
B. You have a completely developed model based on both a sample of the data and the entire set of data available.
C. You have presented the results of the model to both the internal analytics team and the business owner of the project.
D. You have written documentation, and the code has been handed off to the Data Base Administrator and business operations.

正解：D

質問 # 91
In linear regression, what indicates that an estimated coefficient is significantly different than zero?
Response:

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

質問 # 92
What is a core deliverable at the end of the analytic project?
Response:

A. A presentation for project sponsors
B. A whitepaper describing the project and the implementation
C. An implemented database design
D. The training materials

正解：A

質問 # 93
When is a Wilcoxon Rank-Sum test used?
Response:

A. When the data can be easily sorted
B. When the populations represent the sums of other values
C. When the data cannot be easily sorted
D. When an assumption about the distribution of the populations cannot be made

正解：D

質問 # 94
A time series of monthly sales indicates a periodic pattern, and the value reaches the peak every December. Which statistic needs to be subtracted from the actual value to adjust for this seasonal effect?
Response:

A. Average value for each month over a few years
B. Least-squares-fit line of the series
C. Mean value of sales within each year
D. Mean value of sales over the whole time series

正解：A

質問 # 95
Which key role for a successful analytic project can provide business domain expertise with a deep understanding of the data and key performance indicators?
Response:

A. Project Manager
B. Business User
C. Business Intelligence Analyst
D. Project Sponsor

正解：C

質問 # 96
What are challenges presented by Big Data?
Response:

A. New technologies, tools and regulatory rules only
B. New technologies, tools, and business processes only
C. New technologies, tools, business processes, and regulatory rules
D. New technologies, and tools only

正解：C

質問 # 97
What is required in a presentation for business analysts?
Response:

A. Budgetary considerations and requests
B. Operational process changes
C. Detailed statistical explanation of the applicable modeling theory
D. The presentation author,s credentials

正解：B

質問 # 98
Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
Response:

A. There are categorical variables in the model.
B. There are missing values in the data.
C. There is not enough data to create a test set.
D. The data is unformatted.

正解：C

質問 # 99
Refer to the exhibit.

The exhibit shows four graphs labeled as Fig A thorough Fig D. Which figure represents the entropy function relative to a Boolean classification and is represented by the formula shown in Exhibit?
Response: