Data Collection and Preprocessing MCQ Questions and Answers

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Each section contains 100 MCQs on Data Collection and Preprocessing .

Which of the following can be used to view all the tables in memory?

A) tables B) alltable C) table D) none of the mentioned

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement.

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

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement.

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which of the following is the most common problem with messy data?

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

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Following figure represents correct sequence of steps in performing data analysis.

A) True B) False

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the correct statement.

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

tidyr is a reframing of . . . . . . . . designed to accompany the tidy data framework.

A) reshape5 B) dplyr C) reshape2 D) all of the mentioned

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Strange binary file generated from machines is an example of tidy data.

A) True B) False

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which of the following package loads data from SPSS?

A) read.spss(SPSS) B) read.oct(SPSS) C) read.xpot(SPSS) D) all of the mentioned

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Point out the wrong statement.

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

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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