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Questions and Answers
What is the primary purpose of a bar graph?
What is the primary purpose of a bar graph?
- To compare the magnitude of different values (correct)
- To display the frequency of a categorical variable
- To find the mode of a dataset
- To show the relationship between two variables
Which of the following is an example of discrete data?
Which of the following is an example of discrete data?
- The height of a person
- The number of students in a class (correct)
- The time taken to complete a task
- The temperature of a city on a given day
What is the median of a dataset that is arranged in ascending order: 12, 15, 18, 20, 25, 30, 35?
What is the median of a dataset that is arranged in ascending order: 12, 15, 18, 20, 25, 30, 35?
- 20
- 25
- 22
- 20.5 (correct)
What is the mode of the following dataset: 2, 4, 6, 8, 10, 12, 12, 14?
What is the mode of the following dataset: 2, 4, 6, 8, 10, 12, 12, 14?
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What is the purpose of a cumulative frequency graph?
What is the purpose of a cumulative frequency graph?
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Study Notes
Data Analysis and Visualization
Purpose of Bar Graphs
- The primary purpose of a bar graph is to compare categorical data across different groups.
Types of Data
- Discrete data is an example of data that has specific, distinct values, such as the number of students in a class.
Median Calculation
- To find the median of a dataset, first arrange the data in ascending order: 12, 15, 18, 20, 25, 30, 35.
- Since there are an odd number of data points (7), the median is the middle value, which is 20.
Mode Calculation
- The mode of a dataset is the value that appears most frequently.
- In the dataset: 2, 4, 6, 8, 10, 12, 12, 14, the mode is 12, since it appears twice.
Cumulative Frequency Graphs
- The purpose of a cumulative frequency graph is to display the accumulation of frequencies, providing a visual representation of the total frequency up to a certain point in the data.
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