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Explanation: Data cleaning is critical to the data analysis process as it ensures the accuracy and reliability of the results. Cleaning involves identifying and correcting errors, removing duplicates, and handling missing values. Without this step, subsequent analysis may lead to incorrect conclusions or biased models. For example, if sales data has duplicate entries, the total revenue figure might be inflated. Cleaning ensures that the dataset reflects reality and forms a robust foundation for exploration, modeling, and interpretation. Option A: Data collection is the initial step but does not address inaccuracies inherent in raw data. It only provides the dataset for subsequent steps. Option C: Data visualization is a presentation step used to interpret results, not to ensure accuracy. Option D: Model training uses clean data to develop predictive models but does not address data quality issues directly. Option E: Hypothesis testing comes at a later stage, relying on clean data for meaningful statistical conclusions.
If 'A' stands for '-', 'B' stands for '×', 'C' stands for '+', and 'D' stands for '÷', then what is the value of the following expression.
54 D...
If ‘÷’ means ‘-’, ‘-’ mean ‘+’, ‘+’ means ‘×’ and ‘×’ means ‘÷’, compute the value of the expression:
121 × ...
If + denotes ÷, × denotes -, - denotes ×, and ÷ denotes +, what is the value of the following expression:
124 + 4 × 5 – 6 ÷ 6 + 3 = ?
...If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?
480 - 12 + 250 X 3...
Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.
16 * 5 * 35 ...
Which two signs should be interchanged to make the given equation correct?
11 – 22 + 30 × 25 ÷ 5 = 267
Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
23 * 2 * 2 * 5 * 18
If “+” means “minus”, “×” means “divided by”, “÷” means “plus”, and “-“ means then “multiplied by”
180 × 12 ...
Select the odd group of numbers.(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digi...
Rachit walks a distance of 5 Km towards North, then turns to his left and walks for 3 Km. He again turns left and walks for 5 Km. At this point he turns...