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Dell EMC Data Science and BigData Certification Questions and Answers



Question : What a data scientists can do with the clickstream data?
A. It can be used to discover the usage patterns.
B. It helps in finding the relationships
C. It uncovers the relationships among clicks and areas of interest on a group of websites.


: What a data scientists can do with the clickstream data?
1. A,B
2. B,C
3. A,C
4. A,B,C

Correct Answer : 4
Explanation: First of all you need to understand what a clickstream data is. Clickstream data are groups of clicks in sequence made by a website visitor. For example you searched for Hadoop Learning
Training on Google and google re-direct you to one of the free trainings on the Youtube.com which shows videos published by HadoopExam.com and you click the link of the HadoopExam training channel on the YouTube and
then it will show you channel page and from there you click HadoopExam.com home page. On the Home Page you will be clicking on the Hadoop Professional Training.
So there are almost 4 links/clicks involved Google Search result, YouTube Channel, HadoopExam home page and then finally training page. Which can help you to reach the final destination. So a data scientist can use
these clickstream to find the search/usage patterns and then find the relationship between YouTube videos and the website user interested in so accordingly they can target the customer or user.





Question : What all are the benefits of using the BigData Projects which were not available in the Non-BigData solutions?


: What all are the benefits of using the BigData Projects which were not available in the Non-BigData solutions?
1. It gives very quick results whatever is the data volume.

2. It helps in increasing the data security, which were not available previously.

3. It helps in complex data processing as well as helps in making quick decision even for the real-time high volume data.

4. It helps in your organization technologist requirement.

5. It helps in reducing the marking team size


Correct Answer : 3
Explanation: BigData provides various benefits and more than one option can be correct as given in the question. As we need to select only one option, hence highly accurate answer is required.
BigData solution provides solution for processing even complex data, and you can use various algorithm to make quick decision even you can process data in real time. Hence, option-2 are correct.
Other advantages of the BigData are
- It can help in reducing the cost, for the huge volume of data processing. This may not be true in all the cases. If you are looking for new research than it will require additional money, which in the long run may
return higher value.
- It helps in reducing the overall processing time for huge volume of data. Using the parallel processing, it saves lot of time.
- New data products can be developed, by applying more analytics. Products can be customized as per the customer needs.
- Analyzing Market Conditions: You can apply more analytics on the data and find out what is the market condition.
- Maintaining the brand reputation: You can apply the analytics and find where the weaknesses of the brands is.





Question : Which of the following question statement falls under data science category?
A. What happened in last six months?
B. How many products have been sold in a last month?
C. Where is a problem for sales?
D. Which is the optimal scenario for selling this product?
E. What happens, if these scenario continues?

: Which of the following question statement falls under data science category?
1. A,B
2. B,C
3. C,D
4. D,E
5. A,E

Correct Answer : 4
Explanation: This question wants to check your understanding about BI and Data Science. BI was already existing and analytics team already using it. They need to improve and learn data science technique to
solve some problems. If you check the option given in the question, it will confuse you. But if you have worked in BI or as a Data Scientist then it is easy to answer. First 3 option can be easily answered using
reporting solution, what sales happened in last six month, what was the problem etc.
But for the last two option you need to apply data science techniques like which all scenarios are optimal for product sales, you need to collect the data and applying various techniques for that. Hence, last two
option can only be answered using Data Science technique. And for this you need to apply techniques like Optimization, predictive modeling, statistical analysis on structured and un-structured data.



Related Questions

Question : You have been given two training datasets for different courses in same subject as HEPop and HEPop. You need to find that both the population are same or not. Hence, you decided to use Hypothesis
testing using the t-test. You assume that both the populations have equal distribution and their variance is not known. To conduct the t-test you need to calculate t-statistic, which of the following you would require
for calculating t-statistic?
A. Sample Mean
B. Sample Size
C. Standard Deviation of Sample
D. Population size
E. Mean of the each population
F. Samples Average of Mean values

 : You have been given two training datasets for different courses in same subject as HEPop and HEPop. You need to find that both the population are same or not. Hence, you decided to use Hypothesis
1. A,B,C
2. C,D,E
3. D,E,F
4. A,B,E
5. A,C,F


Question : You are working in a Healthcare company in America, and wanted to measure the weights. As you cannot measure the weight of all the people in entire population. Which of the following formula would be
helpful for this requirement?
 : You are working in a Healthcare company in America, and wanted to measure the weights. As you cannot measure the weight of all the people in entire population. Which of the following formula would be
1. A
2. B
3. C
4. D


Question : Which of the following hypothesis testing would be more reliable when you have unequal variance and unequal sample sizes?


: Which of the following hypothesis testing would be more reliable when you have unequal variance and unequal sample sizes?
1. Student t-tests

2. Welch t-test

3. Logistic regression

4. Linear regression

5. Wilcoxon rank-sum test



Question : You have been given two population HEPop and HEPop, you need to do Hypothesis testing on this data to find that they are equal or not. However, you cannot assume that data is normally distributed. Which
of the following test would help?


 : You have been given two population HEPop and HEPop, you need to do Hypothesis testing on this data to find that they are equal or not. However, you cannot assume that data is normally distributed. Which
1. Use Welch t-test

2. Use Student t-test

3. Use Teacher t-test

4. Use Wilcoxon rank sum test



Question : You are conducting a Hypothesis test and Null Hypothesis is true. But you have rejected that Null Hypothesis, what type of this error?


 : You are conducting a Hypothesis test and Null Hypothesis is true. But you have rejected that Null Hypothesis, what type of this error?
1. Type-I Error

2. Type-II Error

3. Type-III Error

4. Type-IV Error

5. There is no error



Question : You are conducting a Hypothesis test for two populations HEPop and HEPop. Which of the following statements are correct with regards to the Power and Sample Size?
A. The power of a test is the probability of correctly rejecting the null hypothesis
B. The power of a test is the probability of correctly accepting the null hypothesis
C. It is represented as (1-Probability of Type two Error)
D. Power of a test improves when the sample size increases.

: You are conducting a Hypothesis test for two populations HEPop and HEPop. Which of the following statements are correct with regards to the Power and Sample Size?
1. A,B
2. A,C,D
3. A,B,C
4. B,C,D
5. A,B,C,D