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Course: AP®︎/College Statistics > Unit 4. Lesson 2: Z-scores. Z-score introduction. Calculating z-scores. Comparing with z-scores.
If we're given a particular normal distribution with some mean and standard deviation, we can use that z-score to find the actual cutoff for that percentile. In this example, we find what pulse rate represents the top 30% of all pulse rates in a population.
Finding the critical value z* for a desired confidence level. Example constructing and interpreting a confidence interval for p. Calculating a z interval for a proportion. Interpreting a z interval for a proportion. Determining sample size based on confidence and margin of error.
Use standardized scores—also called z-scores— to compare data points from different distributions.
Learn how to calculate a P-value given a z statistic with this Khan Academy video tutorial.
Calculating a z statistic in a one-sample z test about a proportion. If you're seeing this message, it means we're having trouble loading external resources on our website.
Calculating the P-value in a z test for a proportion (practice) | Khan Academy. Explore.
Learn how to calculate the correlation coefficient r and understand its significance in analyzing bivariate data.
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