Videos
AP Statistics
Pick a topic to watch.
7 video lessons
9:03
Topic 1
Exploring One-Variable Data
Measure the same thing twenty times and you will not get the same answer twenty times. Twenty students measure the same table. The values vary. That is not a…
7:31
Topic 3
Collecting Data
An online poll collects thirty thousand replies. A careful survey asks only one thousand people. Which is closer to the truth? The small one, almost every…
8:39
Topic 4
Probability, Random Variables, and Probability Distributions
A basketball player makes five shots in a row. The crowd is sure she is hot tonight. But watch what chance alone can do. Flip a fair coin twenty times. There…
7:32
Topic 5
Sampling Distributions
Two thousand students go to this school, and some of them cycle here. We want to know what share. Nobody can ask all two thousand, so we ask a random hundred.…
7:52
Topic 6
Inference for Categorical Data: Proportions
A city wants to know how many people support a new policy. We cannot ask everyone, so we ask two hundred at random. A hundred and twenty say yes — sixty…
7:38
Topic 7
Inference for Quantitative Data: Means
You already know the heart of inference. Take a sample, find its mean, then do it again and again. Even when the population is lopsided, those sample means…
7:59
Topic 9
Inference for Quantitative Data: Slopes
Here is one class on a scatterplot: hours of revision along the bottom, test score up the side. The line of best fit climbs. But this is only one class. Take a…