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3 cards from this section. Quick, good the night before a test.
What is the mean of the dataset {10, 12, 8}?
Add the numbers and divide by how many there are.
If variance is 4, what is the standard deviation?
Remember: SD = √Variance.
What is the formula for calculating variance?
Think about the differences from the average.
True or False: A lower standard deviation indicates that data points are widely spread out.
What does 'spread out' mean in this context?
Given the dataset {5, 9, 4, 2, 1}, calculate the mean, variance, and standard deviation.
Make sure to perform each calculation step by step.
Discuss how the presence of outliers can skew both the variance and the standard deviation in a set of data.
Think about extreme values and their impact on average measures.
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