UPDATED [2024] Pass EMC D-DS-FN-23 Exam in First Attempt Guaranteed
Pass D-DS-FN-23 Exam Latest Practice Questions
NEW QUESTION # 87
Refer to the exhibit.
In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset.
What can you conclude from only this exhibit?
- A. Differencing is required before proceeding with any analysis
- B. Lag 7 has a significant negative autocorrelation
- C. There is no structure left to model in the data
- D. There is significant autocorrelation through lag 3
Answer: D
NEW QUESTION # 88
In a Student's t-test, what is the meaning of the p-value?
- A. it is the "power" of the Student's t-test
- B. it is the area under the appropriate tails of the Student's distribution
- C. it is the mean of the distribution for the alternate hypothesis
- D. it is the mean of the distribution for the null hypothesis
Answer: B
NEW QUESTION # 89
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?
- A. pairs()
- B. lm()
- C. rug()
- D. plot(density())
Answer: A
NEW QUESTION # 90
Which function shown in the exhibit is used to calculate the sample variance?
- A. a
- B. c
- C. d
- D. b
Answer: A
NEW QUESTION # 91
What is a property of window functions in SQL commands?
- A. They can be used between the keywords FROM and WHERE in a SELECT command.
- B. They don't require ordering of data within a window.
- C. They group rows into a single output row.
- D. They can be used to calculate moving averages over various intervals.
Answer: D
NEW QUESTION # 92
Refer to the Exhibit.
You are going into a meeting where you anticipate your manager will have a question on your dataset.
Specifically, your manager will want to know about customers that are classified as renters with a good credit status.
In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT.
What is the confidence of this rule?
- A. 41%
- B. 63%
- C. 73%
- D. 18%
Answer: B
NEW QUESTION # 93
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. Association rules
- C. Student T-test
- D. One-way ANOVA
Answer: D
NEW QUESTION # 94
In addition to the business question and descriptions of available data sets, what else would an analytic plan include?
- A. Relevant statistical tests
- B. Existing solutions to the business question
- C. Access credentials to database and/or Hadoop cluster
- D. Initial hypotheses
Answer: D
NEW QUESTION # 95
What is the mandatory Clause that must be included when using Window functions?
- A. RANK BY
- B. PARTITION BY
- C. RANK
- D. OVER
Answer: D
NEW QUESTION # 96
Your colleague, who is new to Hadoop, approaches you with a question. They want to know how best to access their data. This colleague has previously worked extensively with SQL and databases.
Which query interface would you recommend?
- A. Howl
- B. Pig
- C. HBase
- D. Hive
Answer: D
NEW QUESTION # 97
In a decision tree, what is an example of a pure node?
- A. 50 positives; 50 negatives
- B. 25 positives; 75 negatives
- C. 100 positives; 0 negatives
- D. 75 positives; 25 negatives
Answer: C
NEW QUESTION # 98
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 # 99
Since R factors are categorical variables, they are most closely related to which data classification level?
- A. nominal
- B. ratio
- C. ordinal
- D. interval
Answer: A
NEW QUESTION # 100
You are provided with the following list.
Which window function is missing?
cume_dist()
dense_rank()
rank()
percent_rank()
first_value()
last_value()
lag()
lead()
ntile()
- A. cumulative_sum()
- B. row_preceding()
- C. row_number()
- D. median()
Answer: C
NEW QUESTION # 101
Refer to the exhibit.
In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset.
What can you conclude based only on this exhibit?
- A. Lag 1 has a significant autocorrelation
- B. There appears to be no structure left to model in the data
- C. There appears to be a cyclical component in the data
- D. There appears to be a seasonal component in the data
Answer: B
NEW QUESTION # 102
You are performing a market basket analysis using the Apriori algorithm.
Which measure is a ratio describing the how many more times two items are present together than would be expected if those two items are statistically independent?
- A. Confidence
- B. Lift
- C. Support
- D. Leverage
Answer: B
NEW QUESTION # 103
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. Bread -> Milk
- B. Milk -> Bread
- C. Eggs -> Milk
- D. Milk -> Eggs
Answer: C
NEW QUESTION # 104
You submit a Map Reduce job to a Hadoop cluster. However, you notice that although the job was successfully submitted, it is not completing.
What should be done to identify the issue?
- A. Ensure JobTracker is running
- B. Ensure NameNode is running
- C. Ensure DataNode is running
- D. Ensure TaskTracker is running
Answer: D
NEW QUESTION # 105
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?
- A. Left outer join
- B. Cross join
- C. Inner join
- D. Full outer join
Answer: D
NEW QUESTION # 106
Which word or phrase completes the statement; "A theater actor is to 'artistic and expressive' as a data scientist is to."?
- A. Independent and intelligent
- B. Communicative and collaborative
- C. Logical and steadfast
- D. Introverted and technical
Answer: B
NEW QUESTION # 107
Which visualization technique should be avoided?
- A. Achieving a high data-ink ratio
- B. Using visuals to illustrate key points
- C. Using a small number of contrasting colors to draw distinctions
- D. Using 3-dimensional charts
Answer: D
NEW QUESTION # 108
Your risk analysis team has access to new customer financial data. You want to use this data to improve your prediction of credit default. Previously, the team was using only credit bureau scores, loan size, and customer income to assess risk of default.
What is the null hypothesis that should be used to evaluate the model?
- A. Model using the new financial data predicts the outcome better than the previous model
- B. New model predicts better than the toss of a coin weighted by the average default rate
- C. Model using the new financial data predicts the outcome just as well as the previous model
- D. New model predicts as well as the toss of a coin weighted by the average default rate
Answer: C
NEW QUESTION # 109
What should be subtracted to remove a simple linear trend from a time series?
- A. Least-squares-fit line
- B. Expected absolute deviation
- C. Cubic-spline
- D. Expected squared deviation
Answer: A
NEW QUESTION # 110
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