3.1 - Variance
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Practice Questions
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What does variance measure?
💡 Hint: Think about how data points are spread out.
Provide an example of a dataset with low variance.
💡 Hint: Consider scores close to each other.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary purpose of calculating variance?
💡 Hint: Consider what variance represents.
True or False: A variance of zero indicates a perfectly spread dataset.
💡 Hint: Think about what a variance of zero suggests.
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Challenge Problems
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Given a set of test scores from two different classes, Class A: [80, 85, 90, 95], Class B: [70, 90, 110, 130]. Calculate and compare the variances.
💡 Hint: Look at the range of scores in each class.
Consider two investments: Investment X shows returns of [3%, 4%, 2%, 1%, 5%], while Investment Y shows returns of [0%, 15%, -5%, 20%]. Discuss which investment has more predictable returns based on variance.
💡 Hint: Analyze how each investment's returns are clustered.
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