Online Access Free D-DS-FN-23 Practice Test

Which R data structure allows elements to have different data types?

• A.List
• B.Vector
• C.Matrix
• D.Array

Which visualization technique should be avoided?

• A.Using tables of numbers to present all of the data visually
• B.Using visuals to illustrate key points
• C.Using a small number of contrasting colors to draw distinctions
• D.Achieving a high data-ink ratio

The Marketing department of your company wishes to track opinion on a new product that was recently introduced. Marketing would like to know how many positive and negative reviews are appearing over a given period and potentially retrieve each review for more in- depth insight.
They have identified several popular product review blogs that historically have published thousands of user reviews of your company's products. You have been asked to provide the desired analysis.
You examine the RSS feeds for each blog and determine which fields are relevant. You then craft a regular expression to match your new product's name and extract the relevant text from each matching review.
What is the next step you should take?

• A.Read the extracted text for each review and manually tabulate the results
• B.Use the extracted text and your regular expression to perform a sentiment analysis based on mentions of the new product
• C.Group the reviews using Naïve Bayesian classification
• D.Convert the extracted text into a suitable document representation and index into a review corpus

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.One-way ANOVA
• B.Association rules
• C.K-means clustering
• D.Student T-test

On analyzing the results of a K-means clustering output, you noticed that splits on variables you expected to see were not observed.
What actions should be taken?

• A.Decrease the number of variables in the model
• B.Increase the value of K
• C.Use the value of K where the value of WSS given for K represents the overall dispersion of the data
• D.Decrease the value of K