Examunion EMC E20-007 study guide pdf

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Share some Data Scientist E20-007 exam questions and answers below.
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

You have been assigned to do a study of the daily revenue effect of a pricing model of online transactions. You have tested all the theoretical models in the previous model planning stage, and all tests have yielded statistically insignificant results. What is your next step?
A. Report that the results are insignificant, and reevaluate the original business question.
B. Run all the models again against a larger sample, leveraging more historical data.
C. Move forward on the model with the highest significance scores relative to the others.
D. Modify samples used by the models and iterate until a significant result occurs.
Answer: A

Which type of numeric value does a logistic regression model estimate?
A. Probability
B. A p-value
C. Any integer
D. Any real number
Answer: A

Which word or phrase completes the statement? Structured data is to OLAP data as quasi-structured data is to____
A. Clickstream data
B. XML data
C. Text documents
D. Image files
Answer: A

In data visualization, what is used to focus the audience on a key part of a chart?
A. Emphasis colors
B. Detailed text
C. Pastel colors
D. A data table
Answer: A

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Created on Sep 16th 2017 00:49. Viewed 188 times.

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