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Data cleaning is an essential first step after collecting raw data, ensuring the dataset is accurate, consistent, and usable. Cleaning involves handling missing values, removing duplicates, correcting inaccuracies, and standardizing formats. For example, in a customer churn analysis, incomplete demographic information, inconsistent subscription statuses, or duplicate entries could skew results. By addressing these issues upfront, the data analyst lays a solid foundation for reliable analysis, avoiding errors in downstream processes such as EDA, modeling, or visualization. Cleaning ensures data integrity, which is critical for building models or interpreting trends accurately. Why Other Options Are Incorrect: • A: Building predictive models without clean data can lead to flawed or unreliable predictions. • B: EDA should follow data cleaning to ensure the trends and patterns observed are valid. • C: Visualization comes after data analysis and modeling, not before. • D: KPIs should be defined during the planning phase, before collecting and cleaning data.
Find the wrong number in the series.
12, 237, 406, 527, 604, 657
Four males P1, P2, P3 and P4 are sitting in a row facing towards the North (not necessarily in the same order) and four females A1, A2, A3 and A4 are si...
If 'I' stands for '+', 'J' stands for '×', 'K' stands for '÷' and 'L' stands for '–' what will come in place of the question mark (?) in the followi...
Select the correct option from the following options which could create a full square (3 out of 5 images below):
Given in the table are the number codes for the given letters. Select the combination of numbers so that the letters arranged accordingly will form a me...
In a certain code language, 'COURAGE' is written as 'VPDQFHB' and 'MAGICAL' is written as 'HBNHMBD'. How will 'HOSTELS' be written in that language?
Select the option that is related to the third word in the same way as the second word is related to the first word (The words must be considered as mea...
A number has been denoted to each of the given letters. Select the option from the following four possible arrangements of these numbers that forms a me...
Select the figure that will come next in the following series.
Select the option that is related to the third word in the same way as the second word is related to the first word.
Bicycle : Pedal :: Car:?