Class prep · TJ AP Statistics

Ask a precise question,then test it with data.

An independent AP Statistics prep course, from data and study design through probability, sampling distributions, inference for proportions and means, and regression. Choose a method, carry out the calculation, and explain what the evidence supports. Every problem has a full worked solution. Built by Neil Kothari, a TJ alumnus.

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$395 covers the full school year. The first lesson is free.

Try one. This is a test-level question from the course.

Problem 1

Test level
Multiple choice
No calculator
4 pts

Five volunteers each submit one daily comfort rating on each of four days, with no missing records. A report calls these 20 records a sample of 20 different people. Which correction is justified?

original problems, each with a worked answer: 390; original problems, each with a worked answer
at test level or beyond: 270; at test level or beyond
short lessons, one for every topic: 30; short lessons, one for every topic
units, all open now: 5; units, all open now

Free lesson

Lesson 1.1: Investigative Questions and Variables

Define the target, observational unit and measurements before interpreting a statistical summary.

Start with a statistical question, identify the variables and decide what evidence could answer it.

Problem 2

Core
True or false
No calculator
2 pts

True or False: Locker identifiers $101,204,309$ form a quantitative variable because their average can be calculated. The identifiers are permanent names, not measurements of position or size.

Problem 3

Core
Multiple choice
No calculator
4 pts

A puzzle lab has $80$ devices. Three pilot completion times are $14,17,21$ seconds. Which question is statistical because it calls for collecting varying measurements across the devices?

Open the rest of this lesson, free

The full lesson and all 13 of its problems, with every worked answer.

How it works

Class prep that works alongside class

A complete AP Statistics course for students in grades 9 to 12. Work alongside your school course or study the material in sequence after Algebra 1. Each lesson starts with a concrete example, develops the idea, and shows how to check your reasoning before you try the practice.

Original problems in several formats: true or false, multiple choice, multi-part and free response.
Each one is marked core, test level or beyond.
Represent data, critique study designs, calculate probabilities and explain inference in context.
A worked answer for every problem, ending with the mistake that most often costs points.
A lesson on every topic, with diagrams wherever a geometric picture makes the idea clear.

What is inside

1Data and Study Design6 lessons · 78 problems
2Probability and Sampling Distributions6 lessons · 78 problems
3Inference for Proportions6 lessons · 78 problems
4Inference for Means6 lessons · 78 problems
5Regression and Statistical Investigations6 lessons · 78 problems

The front entrance of Thomas Jefferson High School for Science and Technology

Who built it

Neil Kothari

TJHSST alumnus · Co-founder, EduAvenues · 10+ years in TJ preparation

Neil is a TJ alumnus and has spent more than a decade working with TJ students and their families. He built this course so students can connect data, study design, probability and statistical conclusions. Every problem is written for the course and every answer is checked before it goes in.

Tuition

$395for the full school year

One tuition covers every unit of the course. All 5 units are open now. The Investigative Questions and Variables lesson stays free for everyone.

All 5 units: 30 lessons and 390 original problems
A worked answer for every problem
Access through the end of the school year

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