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Data cleaning is widely regarded as the most challenging and time-consuming step in data analysis. Analysts often encounter issues such as missing data, inconsistent formats, outliers, and duplicate entries. Addressing these problems requires a meticulous approach to ensure data quality without losing valuable information. For example, cleaning customer survey data may involve filling missing age values using statistical imputation or correcting typos in categorical fields. Data cleaning underpins the reliability of subsequent steps like modeling and interpretation, making it a critical yet complex task. Why Other Options Are Incorrect: • A: While important, data collection is generally less time-consuming with well-defined sources. • C: Modeling complexity depends on the problem; simple models may suffice in many cases. • D: Visualization requires creativity but is less technically challenging than cleaning. • E: Interpretation is crucial but depends on having clean, reliable data.
Pipes X and Y can independently fill a tank in 80 minutes and 90 minutes respectively, while pipes X and Z together take 3 hours to fill the same tank. ...
A tank has two inlet pipes, A and B, and one outlet pipe, C. Pipe A can fill the tank in 6 hours, and pipe B can fill the tank in 8 hours. Pipe C can em...
Pipe ‘A’ can fill a tank in 10 hours while pipe ‘B’ can empty it in 12 hours. They were operated on alternate hours starting with pipe ‘A’. ...
Pipe ‘A’ can fill a tank in 30 hours while pipe ‘B’ can empty it in 40 hours. They were operated on alternate hours starting with pipe ‘A’. ...
Pipes ‘A’ and ‘B’ can fill a tank in 6 hours and 8 hours, respectively and pipe ‘C’ can empty the full tank in 12 hours. All three pipes are...
Two pipes X and Y can fill a cistern in 21 hours and 24 hours, respectively. The pipes are opened simultaneously, and it is found that due to a leakage ...
Three pipe P1, P2 and P3 fill the tank in 15 hours, 10 hours and 20 hours respectively. If all the three pipes opened together and pipe P2 & P1 are clo...
A tank is filled with three pipes A, B, and C. Pipe A takes 18 hr. to fill 60% of the tank and Pipe B takes 8 hr. to fill 40% of the tank. Pipe A and Pi...
Pipe 'X' takes 50 minutes to fill the tank by itself, while Pipe 'Y' can fill it in 30 minutes on its own. What is the time required for both pipes to f...
