Data Collection and Preprocessing MCQ Questions and Answers | Data Science MCQs

A. tables

B. alltable

C. table

D. none of the mentioned

A. data.table inherits from data.frame

B. data.table is written in Java

C. data.table is faster at subsetting and updating data

D. none of the mentioned

A. gsub is used for fixing character vectors

B. sub is used for finding values like grep

C. grep is used for fixing character vectors

D. none of the mentioned

A. Column headers are values

B. Variables are stored in both rows and columns

C. A single observational unit is stored in multiple tables

D. All of the mentioned

A. True

B. False

A. Data has only qualitative value

B. Data has only quantitative value

C. Data has both qualitative and quantitative value

D. None of the mentioned

A. reshape5

B. dplyr

C. reshape2

D. all of the mentioned

A. True

B. False

A. read.spss(SPSS)

B. read.oct(SPSS)

C. read.xpot(SPSS)

D. all of the mentioned

A. hdf5 can be used to reading/writing from disc in Python

B. rhdf5 is an interface for hdf5 format

C. maximum size of an HDF5 dataset is fixed when it is created

D. all of the mentioned