Data Cleansing Using R MCQs Solution | TCS Fresco Play | Fresco Play

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Data Cleansing Using R MCQs Solution | TCS Fresco Play | Fresco Play



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All Question of the MCQs Present Below for Ease Use Ctrl + F with the question name to find the Question. All the Best!

If you found answer for any of the questions is wrong. Please do mention in the comment section, could be useful for others. Thanks!

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1. Ignoring missing values from your dataset is an easier and correct approach than updating the dataset with mean / median values
May be correct...

2. Data munging is
A Process to clean messy data

3. Can a technically correct dataset still be incorrect for data analysis?
Yes


4. Binning is a method to manage data
noisy data


5. Data cleaning is the most time consuming process in data analysis
True

6. tail() function shows ___ by default
6 rows

7. print() is the recommended function to view the dataset
No,Not....

8. ____ can be used to view data distribution of a single variable AND ____ can be used to view relation between 2 variables
hist(),plot()

9. Consider cars built-in R dataset and find out what is the median of dist variable
36.00

10. Using head function, identify the 8th row of mtcars built-in dataset
10 26


11. Identify the function which is part of dplyr package that helps in previewing the data.
glimpse()


12. In a tidy data set ___ forms a row and ____ forms a column
Observation,Variable


13. A dataset with columns (country, disease, #ofdeaths) has values Row1 - (CONGO, TB, 28) Row2 - (SPAIN, TB, 2) Row3 - (EGYPT, TB, 0). Is this is a tidy or messy dataset.?
Tidy Data


14. filter() is for selecting columns and select() is for selecting rows
False


15. ___ allows to make new variables
mutate()


16. Which function(s) of dplyr would you use to first subset the columns and then sort them on a particular column?
filter(),arrange()


17. What is the class of sys.date() and sys.time()
POSIXct

18. Can a variable of factor type be converted to a date type
No


19. If value of time is system time which is 2016-12-21 18:33:31 UTC. What is the output for time+60
18:34


20. What are the possible outlier treatment
all the options

21. Identify the correct ones
separate() makes


22. ____ is similar to separate() function
extract()

23. Which one is NOT a special value in R
None of the options

24. ____ can be used to identify the existence of a matching pattern in a string
str.detect()


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