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Q61. Which analytical method is considered unsupervised?
A. K-means clustering
B. Na.ve Bayesian classifier
C. Decision tree
D. Linear regression
Answer: A
Q62. Refer to the exhibit
Consider the training data set shown in the exhibit. What are the classification (Y = 0 or 1) and the probability of the classification for the tuple
X(1, 0, 0)
using Naive Bayesian classifier?
A. Classification Y = 0,Probability = 4/54
B. Classification Y = 1,Probability = 4/54
C. Classification Y = 0,Probability = 1/54
D. Classification Y = 1,Probability = 1/54
Answer: A
Q63. Which R data structure allows elements to have different data types?
A. List
B. Vector
C. Matrix
D. Array
Answer: A
Q64. Which word or phrase completes the statement?
Theater actor is to "Artistic and Expressive" as Data Scientist is to
A. "Communicative and Collaborative"
B. "Introverted and Technical"
C. "Logical and Steadfast"
D. "Independent and Intelligent"
Answer: A
Q65. In which lifecycle stage are initial hypotheses formed?
A. Discovery
B. Model planning
C. Model building
D. Data preparation
Answer: A
Q66. 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?
A. You have written documentation,and the code has been handed off to the Data Base Administrator and business operations.
B. You have a completely developed model,and the results have shown statistically acceptable results.
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 a completely developed model based on both a sample of the data and the entire set of data available.
Answer: A
Q67. What is an appropriate data visualization to use in a presentation for a project sponsor?
A. Bar chart
B. Pie chart
C. Box and Whisker plot
D. Density plot
Answer: A
Q68. 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?
A. Document B
B. Document A
C. Document C
D. Document D
Answer: A
Q69. In linear regression modeling, which action can be taken to improve the linearity of the relationship between the dependent and independent variables?
A. Apply a transformation to a variable
B. Use a different statistical package
C. Calculate the R-Squared value
D. Change the units of measurement on the independent variable
Answer: A
Q70. 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. Na.ve Bayesian classifier
B. Linear regression C. Logistic regression D. K-means clustering
Answer: A
Q71. What is a property of window functions in SQL commands?
A. They can be used to calculate moving averages over various intervals.
B. They group rows into a single output row.
C. They can be used between the keywords FROM and WHERE in a SELECT command.
D. They don't require ordering of data within a window.
Answer: A
Q72. What is the purpose of the process step "parsing" in text analysis?
A. imposes a structure on the unstructured/semi-structured text for downstream analysis
B. performs the search and/or retrieval in finding a specific topic or an entity in a document
C. executes the clustering and classification to organize the contents
D. computes the TF-IDF values for all keywords and indices
Answer: A
Q73. Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?
A. Define the process to maintain the model
B. Try different analytical techniques
C. Try different variables
D. Transform existing variables
Answer: A
Q74. Refer to the exhibit.
Click on the calculator icon in the upper left corner. You are going into a meeting where you know your manager will have a question on your dataset -- specifically relating to customers that are classified as renters with good credit status.
In order to prepare for the meeting, you create a rule: RENTER => GOOD CREDIT. What is the confidence of the rule?
A. 63%
B. 41%
C. 18%
D. 73%
Answer: A
Q75. In the MapReduce framework, what is the purpose of the Map Function?
A. It processes the input and generates key-value pairs
B. It collects the output of the Reduce function
C. It sorts the results of the Reduce function
D. It breaks the input into smaller components and distributes to other nodes in the cluster
Answer: A