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4 cards from this section. Quick, good the night before a test.
What is the formula for calculating a z-score?
Think about how far X is from the mean.
What percentage of data falls within 2 standard deviations of the mean?
Use the empirical rule.
What is the empirical rule?
Remember the '68-95-99.7' rule.
Is a z-score of 1.0 above average in a normal distribution?
What does a z-score represent?
A school administers a math test with scores following N(75, 10). What score corresponds to the 95th percentile?
Use the formula for calculating the actual score from z-score.
If data is skewed to the right, why is the normal distribution not suitable for this analysis?
Think about the characteristics of distribution tails.
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