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EMC Dell Data Science Foundations Sample Questions:

1. When would you use a Wilcoxson Rank Sum test?

A) When the data cannot easily be sorted
B) When the data can easily be sorted
C) When the populations represent the sums of other values
D) When you cannot make an assumption about the distribution of the populations

2.
Refer to the exhibit.
To predict whether or not a customer will renew their annual property insurance policy, an insurance company built and operationalized a naive Bayes classification model. In the model, there are two class labels, renewal and non-renewal, that are assigned to each customer based on their attributes.
A subset of the key attributes, their values, and corresponding conditional probabilities are provided in the exhibit.
A customer has the following attributes:
# Age is greater than 65 years
# Owns their own home
# Renewal month is August
If 20% of customers do not renew the police every year, what is the score for a renewal in the naive Bayesian model for the customer described above?

A) 0 0027
B) 0.0270
C) 0.0022
D) 0.0216

3. In which phase of the data analytics lifecycle do Data Scientists spend the most time in a project?

A) Data Preparation
B) Discovery
C) Communicate Results
D) Model Building

4. Refer to the exhibit

Consider the training data set shown in the exhibit.
What are the classification (Y = 0 or 1) and the probability of the classification for the tupleX(0, 0, 1) using Naive Bayesian classifier?

A) Classification Y = 1, Probability = 4/54
B) Classification Y = 0, Probability = 1/54
C) Classification Y = 1, Probability = 1/54
D) Classification Y = 0, Probability = 4/54

5. You are using k-means clustering to classify heart patients for a hospital. You have chosen Patient Sex, Height, Weight, Age and Income as measures and have used 3 clusters.
When you create a pair-wise plot of the clusters, you notice that there is significant overlap between the clusters.
What should you do?

A) Decrease the number of clusters
B) Increase the number of clusters
C) Remove one of the measures
D) Identify additional measures to add to the analysis

Solutions: