Question
A data analyst is working with a dataset containing
missing values, duplicate entries, and inconsistent formats. What is the most important step in ensuring this dataset is ready for analysis?Solution
Explanation: Data cleaning is a crucial step in the data wrangling process, ensuring that datasets are accurate, reliable, and analysis-ready. It involves addressing missing values (e.g., imputing or removing), eliminating duplicates that skew metrics, and standardizing formats for consistency. These steps improve the dataset's integrity and prevent analytical errors. For example, ignoring missing data might lead to biased results, while duplicates can overstate performance metrics like sales volume. Cleaning ensures the dataset reflects reality, forming a robust foundation for valid analysis and decision-making. Option A: Visualizing data is useful for understanding trends but does not resolve issues like missing values or inconsistencies in the dataset. Option C: Building predictive models on unclean data can lead to inaccurate predictions, as the underlying dataset might contain errors. Option D: Aggregating data might simplify analysis but does not address core issues such as missing values or inconsistencies. Option E: Generating reports without cleaning the dataset can lead to incorrect or misleading interpretations of the data.
More roles for women will be opened up in the ranks of soldiers by the Indian army.
Select the correct active \passive form of the given sentence.
Your naughy dog broke my room window this evening.
He built the house in 1980.
The cake was eaten by the children.
The sentence has been given in Active/Passive Voice. Change the voice to Passive/Active.
A book is being read by Vinay
Select the correct passive/active form of the given sentence.
This is the owner who is running the boys’school in prayagraj.
Select the correct active \passive form of the given sentence.
Everyone thinks that the educational system is bad in India.
Choose the option that is the active form of the sentence
The politician’s speech was loudly cheered.
Select the correct active form of the given sentence.
An online order has been placed by me today.
Choose the best way to complete these passive voice sentenceÂ
A story ______