Statistics, Probability, and Survey Sampling
This web site provides training and tools to help you solve
statistics problems quickly, easily, and accurately - without
having to ask anyone for help.
|
Learn at your own pace. Free statistics tutorials cover
statistics, probability,
and survey sampling - all explained in plain English.
|
|
|
AP Tutorial: Read our free, AP statistics tutorial to improve
your skills in all test areas.
>
Learn more |
|
|
Practice exam: Test your understanding of key topics,
through sample problems with detailed solutions.
>
Learn more |
|
|
Study guide: Read our review of the most popular AP study guides,
and choose the right guide for you.
>
Learn more |
|
|
Calculator:
Compare AP-approved graphing calculators, based on price and user
ratings.
>
Learn more |
Analytical Tools
|
Create a list of random numbers, based on your specifications.
- Control list size (generate up to 1000 numbers).
- Specify the range of values that appear in your list.
- Permit or prevent duplicate entries.
Free and easy to use.
>
Learn more
|
|
Create powerful, cost-effective survey sampling plans.
- Find the optimum design (most precision,
least cost).
- See how sample size affects cost and precision.
- Compare different survey sampling methods.
- Assess statistical power and Type II errors.
Tailor your sampling plan to your research needs.
>
Learn more
|
|
Probability Calculators
We wish to express our appreciation to those who assisted in the development of
this web site. We are particularly grateful to the following folks.
- Many thanks to Peter J. Acklam, who wrote the algorithm for
the Normal distribution. He has generously shared that algorithm, which you can
access at:
http://home.online.no/~pjacklam/notes/invnorm.
- We are also grateful to Geoffrey C. Barnes, Ph.D, who wrote a
helpful
VB.Net implementation of the Acklam algorithm.
- A big tip of the hat to Justus Randolph for discovering
and helping to correct an annoying bug in the Stat Trek
code.
- We are indebted to Ian Smith for alerting us to
a problem with the chi square calculator and for his practical
suggestions to fix the problem.
- We are grateful to Chris Headlee,
a math teacher at Marion Senior High School in Virginia,
for thoughtful feedback that greatly improved our discussion
of the negative binomial.
- And finally, thanks to James Ulatowski
of Mercedes, Texas for providing invaluable technical review which
uncovered many mistakes and omissions.
| * |
AP and Advanced Placement Program are registered
trademarks of the College Board, which was not involved in the
production of, and does not endorse this web site. |