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3 cards from this section. Quick, good the night before a test.
What is a Z-Score?
Think about its role in identifying how unusual a value is.
In simple terms, why do we care about outliers?
Consider how they affect averages and relationships.
What does a Z-Score represent?
Remember the purpose of Z-Scores.
True or False: A Z-Score above 3 indicates an outlier in most cases.
Think about the statistical norms.
You have a set of data points: [12, 15, 15, 19, 40]. Calculate the mean, standard deviation, and Z-Scores. Determine if any outliers exist.
Use the mean and standard deviation formulas first.
In a dataset where the mean income is $50,000 and the standard deviation is $10,000, what is the Z-Score for an income of $80,000? Identify if it’s an outlier.
Apply the Z-Score formula carefully.
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