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

Data Science Using R Quiz

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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

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2. ” %>% ” is called*

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

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

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

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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])

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5. _________ is called Grammar of Data Manipulation

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

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6. __________ is called Grammar of Graphics*

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

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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’)

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8. Package to install MySQL database is*

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

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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

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

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

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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”)

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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

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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()

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14. R files has an extension ______*

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

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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))*

• Option 1

• Option 2
• error will be generated

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