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**These are the answers to Digital Analytics & Regression Cognitive Class Course Answers free certification course. These answers have been updated recently and are 100% correct. The final exam is on Monday, April. All answers are 100%.**

**Module 1: Case Study ‘CEO vs. CMO’**

**Question 1: Based on the Case Study you have read, what was the ‘Expert Tip’?**

- Don’t offer your opinion to senior executives if you are new to a company.
- Your first assumption is always the correct one.
- If it can’t be measured, it doesn’t exist.
**When solving business problems with data, be curious.**

**Question 2: You are a newly-hired analyst at a small tech startup in a big metropolitan city. In your first team meeting, and one week before the scheduled product launch, the Chief Executive Officer (CEO) and the Chief Marketing Officer (CMO) have a heated argument about what to call the product.**

**The CEO has done a quick search on Google Trends and found that ‘Analytics’ is, by far, a more popular search term than ‘Data Science’ or ‘Data Scientist’. The CMO, who has some experience in SEM from his work at another tech company, has a gut feeling that ‘Data Scientist Workbench’ will bring the right target group to the new product. The two executives ask you to weigh in.**

**Based on the Case Study you have read, which of the following is the most suitable data set to start an analysis to help the executives decide which term to include in the product name?**

- Existing Company Adwords Data
- Open Data
**Search Engine Trends Data**- Survey Data

**Question 3: Based on the Case Study you have read, how many domains available for purchase?**

- 1
**2**- 3
- 4

**Module 2: Importing Google Trends data in R**

**Question 1: How many rows does the function head(dataset) return?**

**Enter your answer below: 6**

**Question 2: TRUE or FALSE? The function str() can be used to tell you the number of rows and columns in a dataframe, and some other characteristics of the data.**

**True**- False

**Question 3: What does head(case_table$WeekID) do?**

**Enter your answer below:**

- returns the first six rows of case_table and all of its columns
- returns all the data in case_table
**returns the first six items of the WeekID column in case_table**- returns the entire WeekID column of data in case_table

**Module 3: Plotting & Correlation**

**Question 1: A correlation score of 0.9 between variables X and Y indicate which of the following?**

- As X increases, Y decreases.
- There is a weak positive correlation between X and Y.
- X and Y are opposites of each other.
**A strong positive correlation.**- X causes Y.

**Question 2: In the R script file, which command can you use to plot line graphs?**

- makePlot( )
- createGraph( )
**plot( )**- linegraph( )
- graph( )

**Question 3: Which search term has the most number of searches?**

- Machine Learning
- Data Scientist
**Analytics**- Data Science
- Regression

**Module 4: Simple Linear Regression in R**

**Question 1: Running a linear model in R for a dataset results in the formula: Y = 5.0 + 3.0X. Which of the following is true?**

- Y will always be positive.
- X is 3 times as large as Y.
- There is a negative correlation between X and Y.
- As X increases, Y decreases.
**When X is equal to 5, the model predicts that Y will equal 20.**

**Question 2: What is the correlation between searches for ‘data science’ and ‘data scientist’? Give the numeric answer to two decimal places.**

**Answer:**

**Question 3: In R, what symbol or character do we use to specify a column in a table?**

- ?
- ==
- /
**$**

**Digital Analytics & Regression Final Exam Answers – Cognitive Class**

**Question 1: What is the mean of the values for Hadoop searches? Your answer should include two decimal places (for example, 10.01).**

**Answer:**

**Question 2: What is the R Squared for the Regression model in the exam data set? The answer format must be a percentage with no decimal places. For example, if the R^2 value is 0.5, then you should write 50 below.**

**Answer:**

**Question 3: In the Linear Model, ‘Hadoop’ is the Y variable, TRUE/FALSE?**

- TRUE
**FALSE**

**Question 4: Having now gone through the exercises in this course, and going back to the debate between the CEO vs. CMO, what product name was chosen as the most suitable for the target audience?**

- Analytics Workbench
**Data Scientist Workbench**

**Question 5: What is the correlation (as a %) between the two search terms in the exam data set? For example, if the correlation is 0.5, enter 50 below.**

**Answer:**

**Question 6: Generally speaking, the simple linear model created from these two search terms fits the data well, TRUE/FALSE?**

**TRUE**- FALSE

**Question 7: Which R function creates a linear model?**

**lm ( )**- abline ( )
- regression ( )
- summary ( )

**Question 8: Determine the formula for your linear model. Using the linear model you have just created to predict search index values: if the search index for ‘Hadoop’ is 35, what is the predicted corresponding search index for ‘Big Data’ according to your model?**

- 88
- 19
- 45
**30**

**Question 9: What weeks correspond to WeekID 16?**

- 2004-06-06 – 2004-06-12
- 2004-01-25 – 2004-01-31
**2004-04-18 – 2004-04-24**- 2004-08-15 – 2004-08-21

**Conclusion**

Quizzes can be used to generate more interest among the students who want to learn in a competitive situation. Two such quizzes that work well with students in the middle school year level include “The Hollow Square Quiz” and “The Hollow Circle Quiz.” The second quiz is called “The Student Created Quiz”, which can be used as part of the revision program. From our website the student of each group will be get quiz answers on that topic.