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NEW QUESTION # 90
When is a Wilcoxon Rank-Sum test used?
Response:
- A. When an assumption about the distribution of the populations cannot be made
- B. When the data cannot be easily sorted
- C. When the populations represent the sums of other values
- D. When the data can be easily sorted
Answer: A
NEW QUESTION # 91
You have used k-means clustering to classify behavior of 100, 000 customers for a retail store. You decide to use household income, age, gender and yearly purchase amount as measures. You have chosen to use 8 clusters and notice that 2 clusters only have 3 customers assigned.
What should you do?
Response:
- A. Decrease the number of measures used
- B. Increase the number of clusters
- C. Decrease the number of clusters
- D. Identify additional measures to add to the analysis
Answer: C
NEW QUESTION # 92
Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?
Response:
- A. There are categorical variables in the model.
- B. The data is unformatted.
- C. There is not enough data to create a test set.
- D. There are missing values in the data.
Answer: C
NEW QUESTION # 93
Refer to 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. You cannot request additional data.
What is a way that you could try to increase the R2 of the model without artificially inflating it?
Response:
- A. Create clusters based on the data and use them as model inputs
- B. Create interaction variables based only on variables A, B, and C
- C. Force all 15 variables into the model as independent variables
- D. Break variables A, B, and C into their own univariate models
Answer: A
NEW QUESTION # 94
Refer to the exhibit.
You have run a linear regression model against your data, and have plotted true outcome versus predicted outcome. The R-squared of your model is 0.75. What is your assessment of the model?
Response:
- A. The R-squared is good. The model should perform well.
- B. The R-squared may be biased upwards by the extreme-valued outcomes. Remove them and refit to get a better idea of the model,s quality over typical data.
- C. The observations seem to come from two different populations, but this model fits them both equally well.
- D. The extreme-valued outliers may negatively affect the model,s performance. Remove them to see if the R-squared improves over typical data.
Answer: B
NEW QUESTION # 95
You have just completed the Discovery phase of a project and finished interviewing the main stakeholders. You have identified the necessary data feeds and are now beginning to set up the analytic sandbox. What is the next step?
Response:
- A. Create data visualizations
- B. Run descriptive statistics for several data sets
- C. Perform ELT / ETL
- D. Assess data quality
Answer: C
NEW QUESTION # 96
Refer to the exhibit.
In the exhibit, the x-axis represents the derived probability of a borrower defaulting on a loan. Also in the exhibit, the pink represents borrowers that are known to have not defaulted on their loan, and the blue represents borrowers that are known to have defaulted on their loan.
Which analytical method could produce the probabilities needed to build this exhibit?
Response:
- A. Linear Regression
- B. Discriminant Analysis
- C. Logistic Regression
- D. Association Rules
Answer: C
NEW QUESTION # 97
On analyzing your time series data you suspect that the data represented as y1, y2, y3, ... , yn-1, yn may have a trend component that is quadratic in nature.
Which pattern of data will indicate that the trend in the time series data is quadratic in nature?
Response:
- A. (y2-y1) = (y3-y2) = ....... = (yn-yn-1)
- B. ((y2-y1) /y1 ) * 100% = .......((yn-yn-1)/yn-1) * 100%
- C. (y3-y2) - (y2-y1) = .........= (yn-yn-1)-(yn-1-yn-2)
- D. (y4-y2) - (y3-y1) = .........= (yn-yn-2)-(yn-1-yn-3)
Answer: C
NEW QUESTION # 98
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 a DataNode is running
- B. Ensure that the JobTracker is running
- C. Ensure that the NameNode is running
- D. Ensure that the TaskTracker is running
Answer: D
NEW QUESTION # 99
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 Warehouse
- C. Data Mart
- D. Data Repository
Answer: B
NEW QUESTION # 100
When is the GROUP BY ROLLUP clause used in an OLAP query?
Response:
- A. Specific subtotals and grand totals for a combination of variables are only to be included in the output
- B. Subtotals are only to be included in the output
- C. Grand totals are only to be included in the output
- D. All subtotals and grand totals are to be included in the output
Answer: D
NEW QUESTION # 101
Which word or phrase completes the statement; "A theater actor is to 'artistic and expressive' as a data scientist is to."?
Response:
- A. Independent and intelligent
- B. Introverted and technical
- C. Logical and steadfast
- D. Communicative and collaborative
Answer: D
NEW QUESTION # 102
Which word or phrase completes the statement; "A data scientist would consider a RDBMS is to a table as R is to a_____."?
Response:
- A. Array
- B. Data frame
- C. List
- D. Matrix
Answer: B
NEW QUESTION # 103
Consider the following itemsets:
(hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
If the minimum support is 50%, what represents the complete list of frequent 2-itemsets?
Response:
- A. (scarf, gloves), (scarf, coat) (hat, gloves)
- B. (hat, scarf), (scarf, coat), (coat, gloves)
- C. (hat, scarf), (hat, gloves), (scarf, gloves), (scarf, coat)
- D. (hat, scarf), (hat, gloves)
Answer: C
NEW QUESTION # 104
What should be subtracted to remove a simple linear trend from a time series?
Response:
- A. Expected squared deviation
- B. Least-squares-fit line
- C. Cubic-spline
- D. Expected absolute deviation
Answer: B
NEW QUESTION # 105
How does Pig's use of a schema differ from that of a traditional RDBMS?
Response:
- A. Pig,s schema is optional
- B. Pig,s schema supports a single data type
- C. Pig,s schema is required for ETL
- D. Pig,s schema requires that the data is physically present when the schema is defined
Answer: A
NEW QUESTION # 106
In the Map Reduce framework, what is the purpose of the Map Function?
Response:
- A. It collects the output of the Reduce function
- B. It processes the input and generates key-value pairs
- C. It breaks the input into smaller components and distributes to other nodes in the cluster
- D. It sorts the results of the Reduce function
Answer: B
NEW QUESTION # 107
For which class of problem is Map Reduce most suitable?
Response:
- A. Embarrassingly parallel
- B. Non-overlapping queries
- C. Simple marginalization tasks
- D. Minimal result data
Answer: A
NEW QUESTION # 108
Which relationship holds for a confusion matrix?
Response:
- A. Recall = 1 - False Negative Ratio
- B. Precision = 1 - False Negative Ratio
- C. Precision = 1 - False Positive Ratio
- D. Recall = 1 - False Positive Ratio
Answer: A
NEW QUESTION # 109
What is an appropriate data visualization to use in a presentation for an analyst audience?
Response:
- A. Pie chart
- B. Area chart
- C. ROC curve
- D. Stacked bar chart
Answer: C
NEW QUESTION # 110
Which key role for a successful analytic project can provide business domain expertise with a deep understanding of the data and key performance indicators?
Response:
- A. Project Sponsor
- B. Business Intelligence Analyst
- C. Project Manager
- D. Business User
Answer: B
NEW QUESTION # 111
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