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Data Preprocessing and Cleaning Questions and Answers

1.

Which of the following form ordinal variables ?

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

Answer: B

The ordinal variables are Branch manager, Deputy manager, General manager.

An ordinal variable has categories with a meaningful order but no fixed interval between them. Job ranks fit: deputy manager, branch manager and general manager stand in a clear order of seniority, but the 'distance' between ranks is not measurable.

Apple, orange and grape, and pen, ball and tea, are nominal variables: they are categories with no natural order. 'Both (A) and (B)' fails because the fruits are not ordinal.

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2.

The task of correcting and pre processing data is called as

Exam Year(s)

UGC NET - 2013,

Answer: B

The task of correcting and pre-processing data is called data cleaning, option (B). It includes filling in missing values, removing noise and duplicates, and fixing inconsistencies in the data before analysis or loading it into a warehouse. Data streaming is the continuous flow of data records, data mining is the extraction of patterns from the cleaned data, and data storming is not a technical term. So (A), (C) and (D) are wrong.

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