Why is data visualization important?
It helps communicate and understand data accurately and effectively, revealing trends, patterns, and outliers.
What does relative frequency allow us to do?
It allows comparison between groups with different sample sizes by showing proportions instead of counts.
When should pie charts be used?
When the number of categories is small and you want to show parts of a whole. Example: market share by brand.
When are bar charts better than pie charts?
When comparing frequencies or proportions across multiple categories. Bar charts make comparisons clearer.
What is a histogram used for?
To show the distribution of numerical data by grouping observations into bins. Useful for understanding data spread and shape.
What is an outlier?
A data point that differs significantly from other observations. Outliers may indicate measurement error or unique conditions.
What is cumulative relative frequency?
It shows the proportion of data points less than or equal to a certain value. It helps understand thresholds or percentiles.
How does visualizing cumulative frequency help?
It helps estimate probabilities and understand proportions below or above a certain value (e.g., rainfall below 8 inches).
What are key steps in interpreting a graph?
Identify variables, examine trends, compare groups, look for outliers, and interpret overall meaning of the data.
