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If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Explore. Browse By Standards; Virginia Math. NEW. Grade 6 (Virginia) NEW. Grade 7 (Virginia) NEW. Grade 8 (Virginia) NEW. Math: Pre-K - 8th grade; Pre-K through grade 2 (Khan Kids) Early math review; 2nd grade; 3rd grade; 4th grade;
A z-score is an example of a standardized score. A z-score measures how many standard deviations a data point is from the mean in a distribution.
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The idea of spread and standard deviation. Calculating standard deviation step by step. Standard deviation of a population. Mean and standard deviation versus median and IQR. Concept check: Standard deviation. Statistics: Alternate variance formulas.
Lesson 5: More significance testing videos. Hypothesis testing and p-values. One-tailed and two-tailed tests. Z-statistics vs. T-statistics. Small sample hypothesis test.
Given sample results and the test statistic, practice calculating the P-value in a one-sample z test for a proportion.
We'll measure the position of data within a distribution using percentiles and z-scores, we'll learn what happens when we transform data, we'll study how to model distributions with density curves, and we'll look at one of the most important families of distributions called Normal distributions.
The idea of spread and standard deviation. Calculating standard deviation step by step. Standard deviation of a population. Mean and standard deviation versus median and IQR. Concept check: Standard deviation. Statistics: Alternate variance formulas.
Learn about the variance of a population with examples and explanations on Khan Academy.
Lesson 1: Constructing a confidence interval for a population mean. Introduction to t statistics. Simulation showing value of t statistic. Conditions for valid t intervals. Reference: Conditions for inference on a mean. Conditions for a t interval for a mean. Example finding critical t value.