Data Handling Interview Questions and Answers

+2 votes

Q: In the mtcars dataset, how many cars provide a mileage of less than 20 mpg?

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: In the iris dataset, how many flowers havePetal.Length/Petal.Width ratio of less than 10

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: In the iris dataset, how many flowers of species setosa havePetal.Length/Petal.Width ratio of less than 10.

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: What is the average mileage of a car in the mtcars dataset

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: In the hflights dataset, how many flights were cancelled in the month of January 2011

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: Which of the following functions lists all columns in a dataset with few values from each column?

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: Which of the following functions does not list the total number of observations in a dataset?

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: Which of the following functions can be used to find the number or rows and columns in a dataset?

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: dplyr is useful for:

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: tbl is an extension of:

asked May 27, 2019 in Data Handling by tempuser

+2 votes

Q: Which command can be used to import text files in R

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: nrows and skip arguments in the read.table() command can be used to get

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: The function write.csv() exports data into a file. However, this function by default adds rownames to the file. Which argument can be used to turn off addition of rownames?

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: Which package is used to import data from a SQL server to R?

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: The function read.csv() imports data into

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: For a given matrix mat, how do you increment every element of the matrix by 3 and return a vector. (I) sapply(mat, function(x,y) sum(x)+y,y=3) (II) sapply(mat, function(x) sum(x)+3)

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: Which function is used over the margins of an array

asked May 27, 2019 in Data Handling by tempuser

+1 vote

Q: A hospital data contains patient's age and treatment they are undergoing. Which function can be used to find average of patients undergoing each of the treatments?

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: Applying lapply function on a matrix returns

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: Which function is very similar to lapply?

asked May 27, 2019 in Data Handling by tempuser

0 votes

Q: Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?

asked May 27, 2019 in Data Handling by tempuser

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