Dell EMC Data Science and BigData Certification Questions and Answers

Question : Refer to the Exhibit.
In the Exhibit. For effective visualization, what is the chart's primary flaw?



1. The slanting of axis labels.
2. The location of the legend.
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4. The order of the columns.



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Question : Refer to the exhibit
You have plotted the distribution of savings account sizes for your bank. How would you proceed,
based on this distribution?


1. The data is extremely skewed. Replot the data on a logarithmic scale to get a better sense of it.
2. The data is extremely skewed, but looks bimodal; replot the data in the range 2, 500-10, 000 to be sure.
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4. The data is extremely skewed. Split your analysis into two cohorts: accounts less than 2500, and accounts greater than 2500



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Question : Refer to the exhibit.
In the exhibit, a correlogram is provided based on an autocorrelation analysis of a sample dataset.
What can you conclude based only on this exhibit?

1. There appears to be a seasonal component in the data
2. Lag 1 has a significant autocorrelation
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4. There appears to be no structure left to model in the data



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Related Questions

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Question : Which data asset is an example of quasi-structured data?



1. XML data file
2. Database table
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4. Webserver log


Question : What would be considered "Big Data"?


1. An OLAP Cube containing customer demographic information about 100, 000, 000 customers

2. Aggregated statistical data stored in a relational database table

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4. Spreadsheets containing monthly sales data for a Global 100 corporation



Question : When creating a presentation for a technical audience, what is the main objective?


1. Show that you met the project goals
2. Show how you met the project goals
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4. Show the technique to be used in the production environment


Question : In which lifecycle stage are test and training data sets created?



1. Model planning
2. Discovery
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4. Data preparation



Question : Under which circumstance do you need to implement N-fold cross-validation after creating a regression model?


1. The data is unformatted.
2. There is not enough data to create a test set.
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4. There are categorical variables in the model.




Question : Your company has different sales teams. Each team's sales manager has developed incentive
offers to increase the size of each sales transaction. Any sales manager whose incentive program
can be shown to increase the size of the average sales transaction will receive a bonus.
Data are available for the number and average sale amount for transactions offering one of the
incentives as well as transactions offering no incentive.
The VP of Sales has asked you to determine analytically if any of the incentive programs has
resulted in a demonstrable increase in the average sale amount. Which analytical technique would
be appropriate in this situation?




1. One-way ANOVA
2. Multi-way ANOVA
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4. Wilcoxson Rank Sum Test