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EMC D-DS-FN-23 Exam Syllabus Topics:
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NEW QUESTION # 190
Which SQL OLAP extension provides all possible grouping combinations?
- A. UNION ALL
- B. ROLLUP
- C. CUBE
- D. CROSS JOIN
Answer: C
NEW QUESTION # 191
In time series analysis, what statement describes a MA(q) process?
- A. Current time series value depends on the fitted polynomial of order q
- B. Current time series value depends on the q previous values
- C. Current deviation from the time series mean depends on the quotient q
- D. Current deviation from the time series mean depends on the q previous deviations
Answer: D
Explanation:
In a Moving Average (MA) process of order q, the current deviation from the mean is modeled as a linear combination of the previous q deviations (errors).
NEW QUESTION # 192
Which clause is required by all window functions?
- A. PARTITION BY
- B. ORDER BY
- C. RANGE()
- D. OVER()
Answer: D
NEW QUESTION # 193
What are considerations in a data science and Big Data analytics project?
- A. Building data silos and bypassing data privacy rules
- B. Ignoring executive stakeholders and business users
- C. Applying the latest technologies to demonstrate technical skills
- D. Analysis flexibility and decision making
Answer: D
NEW QUESTION # 194
The graph represents the plot of WSS as a function of K for a K-means clustering analysis you performed.
Which point in the graph represents the most optimal value of K?
- A. B
- B. C
- C. D
- D. A
Answer: B
NEW QUESTION # 195
MapReduce is designed to process data in which way?
- A. Many small files processed serially on one machine
- B. Many small files processed in parallel across multiple machines
- C. A few large files split into blocks processed serially on one machine
- D. A few large files split into blocks processed in parallel across multiple machines
Answer: D
Explanation:
MapReduce is designed to process a few large files that are split into blocks and then processed in parallel across multiple machines. This approach allows for efficient distributed processing of large datasets.
NEW QUESTION # 196
Which word or phrase completes the statement? Data-ink ratio is to data visualization as _________.
- A. Data scientist is to big data
- B. Confusion matrix is to classifier
- C. Seasonality is to ARIMA
- D. K-means is to Naive Bayes
Answer: B
NEW QUESTION # 197
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?
- A. 0.42
- B. 42.0
- C. 4.2
- D. 0.042
Answer: B
NEW QUESTION # 198
Which function shown in the exhibit is used to calculate the sample variance?
- A. a
- B. c
- C. b
- D. d
Answer: A
NEW QUESTION # 199
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?
- A. Clustering
- B. Classification
- C. Regression
- D. Association Rules
Answer: D
NEW QUESTION # 200
Which SQL OLAP grouping extension is used to provide hierarchical groupings without examining all possible combinations?
- A. GROUNPING
- B. CUBE
- C. ROLLUP
- D. GROUP_ID
Answer: C
NEW QUESTION # 201
Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
- A. The data is unformatted.
- B. There are categorical variables in the model.
- C. There is not enough data to create a test set.
- D. There are missing values in the data.
Answer: C
NEW QUESTION # 202
You are analyzing data in order to build a classifier model. You discover non-linear data and discontinuities that will affect the model.
Which analytical method would you recommend?
- A. Logistic Regression
- B. ARIMA
- C. Decision Trees
- D. Linear Regression
Answer: C
NEW QUESTION # 203
A business colleague who is new to Hadoop approaches you with a question. The colleague wants to know the best approach to access their data. The colleague has previously worked extensively with SQLand databases.
Which query interface should be recommended?
- A. Hive
- B. Howl
- C. Pig
- D. HBase
Answer: A
NEW QUESTION # 204
Your customer provided you with 2, 000 unlabeled records and asked you to separate them into three groups.
What is the correct analytical method to use?
- A. K-means clustering
- B. Linear regression
- C. Logistic regression
- D. Naive Bayesian classification
Answer: A
NEW QUESTION # 205
Which word or phrase completes the statement? A spreadsheet is to a data island as a centralized database for reporting is to a __________?
- A. Data Mart
- B. Data Repository
- C. Data Warehouse
- D. Analytic Sandbox
Answer: C
NEW QUESTION # 206
Which word or phrase completes the statement? Business Intelligence is to monitoring trends as Data Science is to ________ trends.
- A. Optimizing
- B. Driving
- C. Predicting
- D. Discarding
Answer: C
NEW QUESTION # 207
What are the two data categories that represent qualitative data?
- A. Nominal and ordinal
- B. Nominal and ratio
- C. Ordinal and interval
- D. Ratio and interval
Answer: A
Explanation:
Qualitative data represents non-numeric categories. Nominal data consists of named categories without any order, while ordinal data includes categories with a meaningful order but without consistent intervals between them.
NEW QUESTION # 208
Refer to the exhibit, which shows pairwise counts for items purchased together.
Consider the following association rules:
- Milk -> Eggs
- Eggs -> Milk
- Bread -> Milk
- Milk -> Bread
Which rule has a confidence higher than 70%?
- A. Milk -> Bread
- B. Bread -> Milk
- C. Eggs -> Milk
- D. Milk -> Eggs
Answer: C
NEW QUESTION # 209
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}, {cheese, bread, milk}
- B. {cheese, bread}, {bread, milk}
- C. {cheese}, {bread}, {milk}, {soda}
- D. {cheese, bread}, {cheese, milk}, {bread, milk}
Answer: B
NEW QUESTION # 210
What does a branch represent in a decision tree?
- A. Root of the tree
- B. Class label for the decision tree
- C. Outcome of a test on a variable
- D. Outcome of all prior decisions
Answer: C
Explanation:
A branch in a decision tree represents the outcome of a test or decision on a variable, leading to further splits or classifications based on the test result.
NEW QUESTION # 211
Refer to the exhibit.
You ran a linear regression, and the final output is seen in the exhibit. Based only on the information in the exhibit and an acceptable confidence level of 95%, how would you interpret the interaction of variable D with the dependent variable?
- A. For every 1 unit increase in variable D, holding all other variables constant, we can expect the dependent variable to increase by 10.23 units
- B. For every 1 unit increase in variable D, holding all other variables constant, we can expect the dependent variable to be multiplied by 10.23 units
- C. Variable D is more significant than variables A, B, and C.
- D. In this model, Variable D is not significantly interacting with the dependent variable
Answer: D
NEW QUESTION # 212
In a t-test with unknown variance, what values are used to calculate the t-statistic?
- A. Mean, sample standard deviation, and population size
- B. Mean, standard deviation, and population size
- C. Sample mean, standard deviation, and sample size
- D. Sample mean, sample standard deviation, and sample size
Answer: D
NEW QUESTION # 213
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