What is a key consideration when preparing a presentation intended for analysts?

Focus on clean simple-to-understand visuals

Describe how to implement the model

Provide talking points to promote or evangelize the project

Emphasize the business benefits of implementing the model

Focus on clean simple-to-understand visuals

A logistic regression model is built to determine the probability of a credit card borrower defaulting on a credit loan. A threshold value of 0.3 is selected. Which statement can be used to predict a borrower will default?

If probability > 0.3, then predict the borrower will default

If probability > 0.1, then predict the borrower will default

If probability < 0.1, then predict the borrower will default

If probability > 0.3, then predict the borrower will default

If probability < 0.3, then predict the borrower will default

In hypothesis testing, when does a Type I error occur?

Null hypothesis is rejected when it is actually true

Null hypothesis is rejected when it is actually false

Null hypothesis is rejected when it is actually true

Null hypothesis is accepted when it is actually false

Null hypothesis is accepted when it is actually true

A decision tree is being built. An internal node is being evaluated for partitioning on variables A and B. The entropy of the internal node is 0.8. The entropy for each of the variables is as follows:Variable A: 0.5Variable B: 0.4Which variable will be used to partition the data and what is the information gain?

Variable B; information gain is 0.4

Variable B; information gain is 0.1

Variable B; information gain is 0.4

Variable A; information gain is 0.1

Variable A; information gain is 0.5

In association rules, given items X and Y, what does lift measure?

How many times more often X and Y occur together than expected if they were statistically independent, expressed as a ratio

Percentage of transactions that contain an itemset with X

Percentage of transactions with Xthat also contain Y

Difference in the probability ofX and Y appearing together compared with expectations as if they were statistically independent

How many times more often X and Y occur together than expected if they were statistically independent, expressed as a ratio

Consider the following text:''Stop!'' he shouted. ''Don't go there!''What set of words result from using a tokenizer for punctuation on the text?

Stop, he, shouted, dpnt. go. there

Stop, he, shouted, don. t. go. there

Stop, he shouted, don. t go there

Stop, he shouted, dpnt go there

Stop, he, shouted, dpnt. go. there

What is the similarity between the matrix and array data structures in R?

Both structures can only contain one data type

Both structures can contain only integers

Both structures can only contain one data type

Both structures can store multiple data types

Both structures must be 2-dimensional

Which visualization technique should be avoided?

Using tables of numbers to present all of the data visually

Using a small number of contrasting colors to draw distinctions

Using tables of numbers to present all of the data visually

Achieving a high data-ink ratio

Using visuals to illustrate key points

How should project results be communicated to executives and the project sponsor?

Focus on business outcomes and benefits

Demonstrate your technical prowess to establish credibility

Provide model performance visualizations

Emphasize coding details and technical requirements

What is a business driver for Big Data analytics adoption?

Identify new business opportunities

Implement the latest technology and tools

Identify new business opportunities

Ensure the analysts work in isolation

What characterizes the Hadoop Distributed File System?

Master/ slave system designed to run on commodity hardware

Peer to peer system designed to run on custom designed hardware

Peer to peer system designed to run on commodity hardware

Master/ slave system designed to run on custom designed hardware

Master/ slave system designed to run on commodity hardware

In time series analysis, what function is examined to identify the order of the autoregressive component of an ARIMA model?

Partial autocorrelation function

Lognormal distribution function

Partial autocorrelation function

What does a branch represent in a decision tree?

Outcome of a test on a variable

Class label for the decision tree

What is the purpose of applying the nave Bayes conditional independence assumption?

To simplify the probability calculations

To calculate the probability of rare events

To minimize rounding errors in probability calculations

To accurately calculate each probability

In K-means clustering, what is a graph of the WSS versus the value of K used to help determine?

Optimal distance between clusters

Average distance between observations

Average distance between clusters

In ANOVA, what is the null hypothesis for k population means?

All population means are equal to each other

At least two population means are equal

At least two population means are not equal

At most k-1 population means are equal

When using association rules, what is an itemset?

Set of discrete variables that are linked

Set of continuous variables that are linked

Set of discrete variables that are linked

In a user-defined aggregate function, what is FFUNC?

Optional final calculation function

Segment-level calculation function

What metrics are used to help calculate relevance in text analysis?

Information gain and confidence interval

In the data preparation phase of the data analytics lifecycle, what does the term ''data conditioning'' refer to?

Cleaning the data, normalizing datasets. and performing transformations

Building training and testing datasets

Identifying relationships and correlations among variables

Deploying the model and monitoring its performance

Cleaning the data, normalizing datasets. and performing transformations

MapReduce is designed to process data in which way?

A few large files split into blocks processed in parallel across multiple machines

Many small files processed serially on one machine

A few large files split into blocks processed serially on one machine

Many small files processed in parallel across multiple machines

DELL D-DS-FN-23 Practice Test 1 - Free Online Exam Prep & Questions

Question 1 / 40

When should you consider using multinomial logistic regression over binary logistic regression?

Dependent variable is continuous or dichotomous

Dependent variable is continuous or categorical

Dependent variable has more than two categories

Dependent variable is continuous only

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