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The DEA-7TT2 exam measures the ability of candidates to use statistical tools and techniques to analyze complex data sets, build predictive models, and interpret the results. DEA-7TT2 exam covers a wide range of topics, including data visualization, data mining, data warehousing, and Hadoop, among others. It also evaluates candidates' knowledge of programming languages such as Python, R, and SQL, which are commonly used in data analysis and machine learning.
NEW QUESTION # 76
Refer to the exhibit.
Click on the calculator icon in the upper left corner. An analyst is searching a corpus of documents for the topic "solid state disk".
In the Exhibit, Table A provides the inverse document frequency for each term across the corpus. Table B provides each term's frequency in four documents selected from corpus.
Which of the four documents is most relevant to the analyst's search?
Response:
- A. Document A
- B. Document B
- C. Document D
- D. Document C
Answer: D
NEW QUESTION # 77
Which word or phrase completes the statement; "Excessive emphasis color is to Bar chart as __________________."?
Response:
- A. Multicollinearity is to OLS
- B. Confidence interval is to regression
- C. Multicollinearity is to serial correlation
- D. Confidence is to leverage
Answer: A
NEW QUESTION # 78
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?
Response:
- A. When written documentation has been produced and the code has been handed off to the DBA/operations.
- 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 a model has been completely developed and the results have shown statistically acceptable results.
- D. When the results of the model have been presented to both the internal analytics team and the business owner of the project.
Answer: A
NEW QUESTION # 79
In data visualization, which type of chart is recommended to represent frequency data?
Response:
- A. Line chart
- B. Scatterplot
- C. Histogram
- D. Q-Q chart
Answer: C
NEW QUESTION # 80
Data has been collected on visitors' viewing habits at a bank's website. Which technique is used to identify pages commonly viewed during the same visit to the website?
Response:
- A. Association Rules
- B. Clustering
- C. Classification
- D. Regression
Answer: A
NEW QUESTION # 81
Which characteristic applies mainly to Data Science as opposed to Business Intelligence?
Response:
- A. Data dashboards
- B. Robust reporting
- C. Advanced analytical methods
- D. Focus on structured data
Answer: C
NEW QUESTION # 82
You submit a MapReduce job to a Hadoop cluster. Although the job was successfully submitted, you notice that it is not completing. What should be done?
Response:
- A. Ensure that the JobTracker is running
- B. Ensure that the NameNode is running
- C. Ensure that the TaskTracker is running
- D. Ensure that a DataNode is running
Answer: C
NEW QUESTION # 83
Refer to the exhibit.
You are asked to write a report on how specific variables impact your client's sales using a data set provided to you by the client. The data includes 15 variables that the client views as directly related to sales, and you are restricted to these variables only.
After a preliminary analysis of the data, the following findings were made:
1. Multicollinearity is not an issue among the variables
2. Only three variables-A, B, and C-have significant correlation with sales You build a linear regression model on the dependent variable of sales with the independent variables of A, B, and C. The results of the regression are seen in the exhibit.
Which interpretation is supported by the analysis?
Response:
- A. Variables A, B, and C are significantly impacting sales, but are not effectively estimating sales
- B. Due to the R2 of 0.10, the model is not valid - the linear regression should be rerun with all 15 variables forced into the model to increase the R2
- C. Variables A, B, and C are significantly impacting sales and are effectively estimating sales
- D. Due to the R2 of 0.10, the model is not valid - a different analytical model should be attempted
Answer: A
NEW QUESTION # 84
A data scientist wants to predict the probability of death from heart disease based on three risk factors: age, gender, and blood cholesterol level. What is the most appropriate method for this project?
Response:
- A. K-means clustering
- B. Apriori algorithm
- C. Linear regression
- D. Logistic regression
Answer: D
NEW QUESTION # 85
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
Response:
- A. Data scientist is to big data
- B. K-means is to Naive Bayes
- C. Confusion matrix is to classifier
- D. Seasonality is to ARIMA
Answer: C
NEW QUESTION # 86
In a Logistic Regression, the coefficient for "age" equals -3. What is the correct interpretation of the Logistic Regression coefficient, holding all other variables constant?
Response:
- A. When age decreases by 3 units, the odds of response are multiplied by e(-3) or 0.05
- B. For every 1 unit increase in age, the dependent variable is multiplied by -3
- C. For every 1 unit increase in age, the dependent variable is reduced by 3 units
- D. When age increases by 1 unit, the odds of response are multiplied by e(-3) or 0.05
Answer: D
NEW QUESTION # 87
You have numeric data for more than 500 observations. You are interested in identifying linear relationships among these numeric variables. Which R function should you employ to get the best visualization?
Response:
- A. lm()
- B. pairs()
- C. rug()
- D. plot(density())
Answer: B
NEW QUESTION # 88
Which word or phrase completes the statement? Business Intelligence is to ad-hoc reporting and dashboards as Data Science is to __________.
Response:
- A. Optimization and Predictive Modeling
- B. Sales and profit reporting
- C. Structured Data and Data Sources
- D. Alerts and Queries
Answer: A
NEW QUESTION # 89
When creating a project sponsor presentation, what is the main objective?
Response:
- A. Clearly describe the methods and techniques used
- B. Show that you met the project goals
- C. Show how well the model will meet the SLA (service level agreement)
- D. Show how you met the project goals
Answer: B
NEW QUESTION # 90
The average purchase size from your online sales site is $17, 200. The customer experience team believes a certain adjustment of the website will increase sales.
A pilot study on a few hundred customers showed an increase in average purchase size of $1.47, with a significance level of p=0.1. The team runs a larger study, of a few thousand customers. The second study shows an increased average purchase size of $0.74, with a significance level of 0.03.
What is your assessment of this study?
Response:
- A. The change in purchase size is small, but may aggregate up to a large increase in profits over the entire customer base.
- B. The p-value of the second study shows a statistically significant change in purchase size. The new website is an improvement.
- C. The difference in the change in purchase size between the two studies is troubling; The team should run another, larger study.
- D. The change in purchase size is not practically important, and the good p-value of the second study is probably a result of the large study size.
Answer: D
NEW QUESTION # 91
Which word or phrase completes the statement? A spreadsheet is to a data island as a centralized database for reporting is to a __________?
Response:
- A. Analytic Sandbox
- B. Data Mart
- C. Data Repository
- D. Data Warehouse
Answer: D
NEW QUESTION # 92
What are challenges presented by Big Data?
Response:
- A. New technologies, tools, business processes, and regulatory rules
- B. New technologies, and tools only
- C. New technologies, tools, and business processes only
- D. New technologies, tools and regulatory rules only
Answer: A
NEW QUESTION # 93
You are building a logistic regression model to predict whether a tax filer will be audited within the next two years. Your training set population is 1000 filers. The audit rate in your training data is 4.2%.
What is the sum of the probabilities that the model assigns to all the filers in your training set that have been audited?
Response:
- A. 42.0
- B. 0.042
- C. 4.2
- D. 0.42
Answer: A
NEW QUESTION # 94
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EMC DEA-7TT2 Certification Exam is a comprehensive exam that covers a wide range of topics. DEA-7TT2 exam is divided into four main sections: data science concepts, big data analytics, data mining, and machine learning. Each section contains a number of questions that are designed to test the candidate’s knowledge and skills in that particular area. DEA-7TT2 exam is multiple-choice and requires candidates to answer 60 questions in 90 minutes.
EMC DEA-7TT2 certification exam is a computer-based test that consists of 60 multiple-choice questions. The test taker is given 90 minutes to complete the exam. DEA-7TT2 exam covers a wide range of topics, including data preparation, data analysis, statistics, machine learning, and data visualization. The test is designed to evaluate the test taker’s knowledge of these topics and their ability to apply them in real-world scenarios.
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