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Data Analytics and Visualization (DataSys+ DS0-001) Flashcards
CompTIA DataSys+ DS0-001 Flashcards
| Front | Back |
| Name a common tool used for data analytics. | Tableau. |
| Name one advantage of using dashboards for visualization. | They combine multiple data views in one location for quicker insights. |
| Name one disadvantage of pie charts. | They are difficult to read when there are many categories or when the differences in proportions are small. |
| What does a correlation coefficient measure? | The strength and direction of the relationship between two variables. |
| What does a p-value indicate in hypothesis testing? | The probability of observing the data if the null hypothesis is true. |
| What does ETL stand for in data processing? | Extract, Transform, Load. |
| What does R-squared measure in regression analysis? | The proportion of variance in the dependent variable that is explained by the independent variable(s). |
| What is a histogram used for? | Displaying the distribution of a dataset. |
| What is a key metric in data analysis? | A quantifiable measure used to track performance or progress. |
| What is a time series analysis? | Analyzing data that is sequenced over time to identify trends and patterns. |
| What is data sampling? | Selecting a subset of data points from a larger dataset for analysis. |
| What is meant by "data aggregation"? | The process of summarizing data by grouping and applying aggregate functions like sum or average. |
| What is outlier detection used for? | Identifying data points that deviate significantly from the dataset's other points. |
| What is skewness in a dataset? | The measure of asymmetry in data distribution. |
| What is the difference between a dimension and a measure in Tableau? | A dimension is a categorical field used for categorizing, while a measure provides numerical data for analysis. |
| What is the difference between descriptive and predictive analytics? | Descriptive analytics analyzes past data, while predictive analytics forecasts future outcomes. |
| What is the difference between nominal and ordinal data? | Nominal data has no order, while ordinal data has a meaningful order but no consistent difference between values. |
| What is the difference between structured and unstructured data? | Structured data is organized into defined formats like rows and columns, while unstructured data does not follow a pre-defined model. |
| What is the primary purpose of data visualization? | Communicating insights and making data easier to understand. |
| What is the purpose of a heatmap? | To show values as colors for better visualization of patterns in data. |
| What is the purpose of a regression model? | To predict the value of a dependent variable based on independent variables. |
| What is the purpose of a scatter plot? | To show relationships or correlations between two variables. |
| What is the purpose of normalization in data processing? | To scale data to a common range without distorting differences. |
| Which algorithm is used for clustering in data analytics? | K-means. |
| Which chart type is best for showing trends over time? | Line chart. |
| Which statistical graphic plots data points to show the spread of a dataset? | Box plot. |
| Which type of data is best represented with a bar chart? | Categorical data. |
| Why is it important to clean data before analysis? | To ensure accuracy and reliability in analytics results. |
| Why should you consider data ethics in analytics? | To ensure privacy, fairness, and accuracy in data usage and insights. |
This deck covers key concepts in data analytics and visualization, such as analytical tools, statistical methods, and creating visual representations of data.