Databricks Certified Professional Data Scientist Exam - Topic 2 Question 16 Discussion

Actual exam question for Databricks's Databricks Certified Professional Data Scientist exam

Question #: 16
Topic #: 2

[All Databricks Certified Professional Data Scientist Questions]

Which analytical method is considered unsupervised?

may have a trend component that is quadratic in nature. Which pattern of data will indicate that the trend in the time series data is quadratic in nature?

ANaive Bayesian classifier

BDecision tree

CLinear regression

DK-means clustering
kmeans uses an iterative algorithm that minimizes the sum of distances from each object to its cluster centroid, over all clusters. This algorithm moves objects between clusters until the sum cannot be decreased further. The result is a set of clusters that are as compact and well-separated as possible. You can control the details of the minimization using several optional input parameters to kmeans, including ones for the initial values of the cluster centroids, and for the maximum number of iterations.
Clustering is primarily an exploratory technique to discover hidden structures of the data, possibly as a prelude to more focused analysis or decision processes. Some specific applications of k-means are image processing, medical and customer segmentation. Clustering is often used as a lead-in to classification. Once the clusters are identified,
labels can be applied to each cluster to classify each group based on its characteristics. Marketing and sales groups use k-means to better identify customers who have similar behaviors and spending patterns.

Show Suggested Answer

Suggested Answer: D

by Lynelle at May 07, 2022, 07:28 AM

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Rhea

5 months ago

Surprised to see K-means as the answer, thought it was more about grouping than trends!

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Rene

6 months ago

I thought linear regression was the go-to for trends, not unsupervised.

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Lenna

6 months ago

Wait, isn't decision tree also unsupervised sometimes?

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Glenna

6 months ago

Totally agree, it's all about finding patterns without labels.

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Janet

6 months ago

K-means clustering is definitely unsupervised!

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Deandrea

6 months ago

K-means is definitely an unsupervised method, right? I practiced a similar question where it was about identifying patterns without labels, and that’s what clustering does.

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Truman

6 months ago

I’m a bit confused about this one. I thought linear regression was unsupervised too, but now I’m not so sure. I’ll have to think about it more.

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Verona

6 months ago

I remember studying different analytical methods, and I think K-means clustering is definitely unsupervised. It’s used for grouping data without prior labels.

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Avery

6 months ago

I think unsupervised methods are those that don't require labeled data, like clustering. K-means sounds familiar, but I'm not entirely sure if it's the right answer here.

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Florinda

6 months ago

I'm a bit confused on this one. I'll have to review my Kubernetes notes to make sure I understand the different Service types.

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Azzie

6 months ago

Okay, I've got this. Inflation means there's too much money chasing too few goods, so the prices go up. I think the answer is C.

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Daryl

6 months ago

I think the key here is understanding the difference between a deactivated device and a fully licensed one. On a deactivated device, I imagine the core Office functionality would still work, but more advanced features might be disabled. I'll focus on the basic document-related tasks.

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