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NEW QUESTION # 172
You have scored your Naïve Bayesian Classifier model on "hold out" test data for cross validation. You have determined the way the samples scored and have tabulated them as shown in the exhibit.
What are the Precision and Recall rates of the model?
- A. Precision = 262/277 Recall = 262/288
- B. Precision = 288/262 Recall = 277/262
- C. Precision = 277/262 Recall = 288/262
- D. Precision =262/288 Recall = 262/277
Answer: A
NEW QUESTION # 173
There are three criterions for big data analytics projects which include:
- Decision speed
- Analysis flexibility
What is the additional criteria?
- A. Structure
- B. Security
- C. Throughput
- D. Quality
Answer: C
NEW QUESTION # 174
Which word or phrase completes the statement? A Data Scientist would consider that a RDBMS is to a Table as R is to a ________.
- A. Data frame
- B. List
- C. Array
- D. Matrix
Answer: A
NEW QUESTION # 175
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?
- A. When written documentation has been produced and the code has been handed off to the DBA/operations.
- B. When the results of the model have been presented to both the internal analytics team and the business owner of the project.
- C. When a model has been completely developed based on both a sample of the data and the entire set of data available.
- D. When a model has been completely developed and the results have shown statistically acceptable results.
Answer: A
NEW QUESTION # 176
Adisk drive manufacturer has a defect rate of less than 1.5% with 98% confidence. Aquality assurance team samples 1000 disk drives and finds 14 defective units.
Which action should the team recommend?
- A. There is a flaw in the quality assurance process and the sample should be repeated
- B. A smaller sample size should be taken to determine if the plant is operating correctly
- C. A larger sample size should be taken to determine if the plant is operating correctly
- D. The manufacturing process is functioning properly and no further action is required
Answer: D
NEW QUESTION # 177
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. Association rules
- B. K-means clustering
- C. One-way ANOVA
- D. Student T-test
Answer: C
NEW QUESTION # 178
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?
- A. Ensure that the NameNode is running
- B. Ensure that the JobTracker is running
- C. Ensure that the TaskTracker is running
- D. Ensure that a DataNode is running
Answer: C
NEW QUESTION # 179
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. K-means is to Naive Bayes
- D. Seasonality is to ARIMA
Answer: B
NEW QUESTION # 180
What does a leaf node represent in a decision tree?
- A. Root of the decision tree
- B. Assigned class label
- C. Outcome of a test on a variable
- D. Decision point on a variable
Answer: B
NEW QUESTION # 181
Refer to the exhibit.
In association rules, for itemsets X and Y, which expression defines leverage?
- A. c
- B. d
- C. b
- D. a
Answer: D
NEW QUESTION # 182
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 a strong background in data flow languages and programming.
Which query interface would you recommend?
- A. Hive
- B. HBase
- C. Pig
- D. Howl
Answer: C
NEW QUESTION # 183
Refer to the graphic.
How would you run the MADlib kmeans function?
- A. UPDATE madlib.kmeans SET centroids = madlib.kmeans('km_sample', 'coords', ... );
- B. INSERT INTO madlib.kmeans('km_sample', 'coords', ... );
- C. SELECT * FROM madlib.kmeans('km_sample', 'coords', ... );
- D. ./madlib kmeans run -parallel -source "km_sample.coords" ...
Answer: C
NEW QUESTION # 184
Based on the exhibit, what is a likely issue with the data?
- A. Incomplete data; indicating potential issues with data transmission
- B. Mis-scaled data; indicating potential issues with data entry
- C. Saturated data; indicating potential issues with data definitions
- D. No obvious concerns with the data is visible
Answer: C
NEW QUESTION # 185
Which R data structure allows elements to have different data types?
- A. Vector
- B. List
- C. Array
- D. Matrix
Answer: B
NEW QUESTION # 186
What describes the data repository represented by the 'A' in MAD?
- A. Allows analysts to easily ingest, digest, produce, and adapt data at a rapid pace
- B. Centrally managed and based on long-range, careful design, planning and governance
- C. Enables analysts to study very large datasets without being limited to samples and extracts
- D. Attracts all data sources that occur within an organization, regardless of data quality
Answer: A
NEW QUESTION # 187
What describes the use of UNION clause in a SQL statement?
- A. Operates on queries and potentially decreases the number of rows
- B. Operates on both tables and queries and potentially increases both the number of rows and columns
- C. Operates on tables and potentially decreases the number of columns
- D. Operates on queries and potentially increases the number of rows
Answer: D
NEW QUESTION # 188
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. ARIMA
- B. Linear Regression
- C. Decision Trees
- D. Logistic Regression
Answer: C
NEW QUESTION # 189
You are testing two new weight-gain formulas for puppies. The test gives the results: Control group: 1% weight gain Formula A. 3% weight gain Formula B. 4% weight gain A one-way ANOVA returns a p-value = 0.027
What can you conclude?
- A. Formula B is more effective at promoting weight gain than Formula A.
- B. Formula A and Formula B are both effective at promoting weight gain.
- C. Formula A and Formula B are about equally effective at promoting weight gain.
- D. Either Formula A or Formula B is effective at promoting weight gain.
Answer: D
NEW QUESTION # 190
Based on the graphic, what should be done to begin addressing chart junk?
- A. Remove the legend
- B. Reduce the font size in the axis
- C. Remove the vertical gridlines
Answer: C
NEW QUESTION # 191
You have the following corpus of texts:
"The cat hit the dog."
"The dog bit the mail carrier."
"The mail carrier chased the truck."
"The truck hit the wall while avoiding the dog that chased the cat."
"The cat climbed the wall."
If the tf-idf metric is used to score relevance for search and retrieval, which term has the highest discriminatory power?
- A. Dog
- B. Chased
- C. Truck
- D. Bit
Answer: D
NEW QUESTION # 192
You need to run a hypothesis test across three normally distributed populations.
Which technique should you use?
- A. Z-test
- B. Wilcoxon rank sum test
- C. ANOVA
- D. Welch's t-test
Answer: C
NEW QUESTION # 193
Refer to the exhibit.
You have created a density plot of purchase amounts from a retail website as shown.
What should you do next?
- A. Recreate the plot using the barplot() function
- B. Reduce the sample size of the purchase amount data used to create the plot
- C. Recreate the density plot using a log normal distribution of the purchase amount data
- D. Use the rug() function to add elements to the plot
Answer: C
NEW QUESTION # 194
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