7.6.2.Final Exam - sj50179/IBM-Data-Science-Professional-Certificate GitHub Wiki
Final Exam
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Question 1
What does csvfile stand for?
car seller values- comma separated values
Correct
Question 2
Scikit-learn is used for?
- Statistical modelling including regression and classification.
Fast array processing.
Correct
Question 3
What tells us the way the data is encoded?
Data pathFile path- Encoding scheme
Correct
Question 4
What attribute or function returns the data types of each column?
head()tail()- dtypes
Correct
Question 5
In a dataset what is the name of the columns?
TypeRow- Header
Correct
Question 6
The Matplotlib library is mostly used for what?
Data analysisMachine learning- Data visualization
Correct
Question 7
What would the following code segment output from a dataframe df?
**df.head(5)**
- It would return the first 5 rows of the dataframe
It would return the last 5 rows of the dataframeIt would return all of the rows of the dataframe
Correct
Question 8
What does the following code segment perform in a dataframe?
mean = df["normalized-losses"].mean()
df["normalized-losses"].replace(np.nan, mean)
It drops rows that contain missing valuesIt drops all of the rows in the column "normalized-losses"- It replaces the missing values in the column "normalized-losses" with the mean of that column
Correct
Question 9
How would you multiply each element in the column df["a"] by 2 and assign it back to the column df["a"]?
- df["a"]=2*df["a"]
2*df["a"]df["a"]=df["a"]-1
Correct
Question 10
What function returns the maximum of the values requested for the requested column?
- max()
min()std()
Correct
Question 11
Since most statistical models cannot take objects or strings as inputs, what action needs to be performed?
- Convert categorical variables into numerical values
Convert numerical values into categorical variables
Correct
Question 12
What function will change the name of a column in a dataframe?
- rename()
exchange()replace()
Correct