Data Science Using R ‘Value Added’ (Quiz 2)

Data Science Using R Quiz

More on Data Science Using R : Click Here

Quiz

1. CSV files can be imported and read using:*

  1. read.table(“file.csv”)
  2. read.csv(“file.csv”)
  3. write.csv(“file.csv”)
  4. none of the above

2. ” %>% ” is called*

  1. pipe operator
  2. reference operator
  3. modulus operator
  4. dereference operator

3.  consider laptops dataset , to create a apple_laptop dataset having Manufacturer only Apple which command will be used*

img1
  1. laptops %>% filter(Manufacturer==”Apple”)->apple_laptop
  2. laptops %>% filter(Manufacturer==”Apple”)<-apple_laptop
  3. laptops %>% select(Manufacturer==”Apple”)->apple_laptop
  4. laptop %>% filter(Category==”Apple”)->apple_laptop

4. consider the dataset in question 3. Which command will be used to select column 2 and 3.*

  1. laptops %>% select(2,3)
  2. laptops %>% filter(2,3)
  3. laptops[2,3]
  4. laptops %>% select([2,3])

5. _________ is called Grammar of Data Manipulation

  1. dplyr
  2. ggplot2
  3. purrr
  4. tibble

6. __________ is called Grammar of Graphics*

  1. dplyr
  2. ggplot2
  3. purrr
  4. tibble

Data Science Using R Quiz

7. Choose correct command to create a connection with MySQL database*

  1. dbconnect(MySQL(),user=’root’, password=’password’,dbname=’mydb’,host=’localhost’)
  2. dbConnect(MySQL(),user=’root’, password=’password’,dbname=’mydb’,host=’localhost’)
  3. dbconnect(MySQL(),user=’root, password=’password’,dbnames=’mydb’,host=’localhost’)
  4. connect(MySQL(),user=’root, password=’password’,dbname=’mydb’,host=’localhost’)

8. Package to install MySQL database is*

  1. RMySQL
  2. MySQL
  3. RMYSQL
  4. none of the above

9. scatter plot is used to*

  1. depict relationship between 2 variables
  2. represent categorical data
  3. represent distribution of quantitative data
  4. represent distribution of qualitative data

10. __________ is the geometric function in ggplot for histogram*

  1. geom_hist()
  2. geom_histogram()
  3. geom_histo()
  4. histogram()

11.  In order to retrieve  all values from a database named student ___________ command is used in R*

  1. fetch(dbSendQuery(MySQL_connection, “Select * from student”))
  2. Fetch(dbSendQuery(MySQL_connection, “Select all from Student”))
  3. fetch(dbSendQuery(MySQL_connection, “Select all from students”))
  4. dbSendQuery(MySQL_connection, “Select all from Student”)

12. Data Science is an interdisciplinary field that uses scientific methods, processes, algorithms and systems to extract knowledge and insights from*

  1. noisy data
  2. structured data
  3. unstructured data
  4. all of the above

13.  in order to write the title of a plot generated by ggplot2 package. which of the following functions is used*

  1. ggtitle()
  2. ggwrite()
  3. ggdesc()
  4. ggtext()

14. R files has an extension ______*

  1. .R
  2. .rp
  3. .c
  4. .s

15.  consider two vectors > x<-c(1,2,3,4)> y<-c(5,6,7,8) what will be the output of code z<-cbind(x,y))*

img2
  • Option 1
img3
  • Option 2
  • error will be generated

Link to Enroll in Data Visualization Using R Coursera: Click Here

* The material and content uploaded on this website are for general information and reference purposes only. Please do it by your own first. COPYING MATERIALS IS STRICTLY PROHIBITED.


More from PROGIEZ