Data Analytics Questions and Answers Already Graded A

Data Analytics Questions and Answers Already Graded A What is a data model? A framework used to organize and structure data for analysis What is regression analysis used for? To predict the value of a dependent variable based on one or more independent variables What is the purpose of a scatter plot in data visualization? To visualize the relationship between two continuous variables What is the difference between descriptive and predictive analytics? Descriptive analytics summarizes historical data, while predictive analytics forecasts future outcomes What is a time series analysis used for? To analyze data points collected or recorded at specific time intervals 2 How can missing data be handled in a dataset? By either imputing missing values, removing rows or columns, or using algorithms that can handle missing data What is a box plot used to display? The distribution of data, including quartiles and outliers What is hypothesis testing in data analytics? A statistical method used to test if a hypothesis about a dataset is true or false What is the importance of data visualization in analytics? Data visualization helps communicate insights and findings from data in a more accessible and understandable way What is the purpose of using a pivot table in data analysis? To summarize and aggregate data based on specific categories What does "data aggregation" mean? 3 The process of combining multiple data points to produce a summary or overall value What is an outlier in a dataset? A data point that is significantly different from the other data points in the dataset What is the purpose of feature engineering in data analysis? To create new features or modify existing ones to improve the performance of predictive models What is the role of machine learning in data analytics? Machine learning algorithms can analyze data to identify patterns and make predictions or decisions without explicit programming What is a bar chart used for? To compare discrete categories or values across different groups What is the difference between supervised and unsupervised learning in machine learning? 4 Supervised learning uses labeled data to train models, while unsupervised learning works with unlabeled data to find patterns What is the main objective of a classification