About Stat Trek
If this is your first visit to StatTrek.com, welcome. Our mission is to help
you solve common statistical problems - quickly, easily, and cost-effectively.
Our Focus
We provide on-line support for the following topics:
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Survey sampling - sample size, sample allocation, simple
random sampling, stratified sampling, and cluster sampling.
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Parameter estimation - margin of error and confidence interval for mean scores
and proportions.
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Hypothesis testing - Type I and Type II errors, power calculations,
significance level, region of acceptance.
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Probability distributions - normal, t, binomial, hypergeometric, multinomial, and Poisson distributions.
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Foundations of statistics - factorials, combinations, permutations, probability,
conditional probability.
Our Services
We offer two types of online services: (1) analytical tools and
(2) training services. All of our services are developed with three criteria
in mind:
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Technical quality. Each algorithm has been checked and double-checked for
accuracy.
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Ease of use. Simple instructions guide users.
On-line help answers questions. Calculations are automatic, "behind
the scenes".
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Clear reporting. Answers are clear and concise. Statistical terms are explained.
Analytical techniques are documented.
For a complete list of analytical and training services, see
Products and Services.
Our Pricing
Nearly all of Stat Trek's analytical tools and training services are free,
accessible to anyone who visits the web site.
The only fee-based tool is the
Sample Planning Wizard. The Sample Planning Wizard is
available only to licensed users.
For a list of current license plans, see
Stat Trek Registration: Choose License Plan.
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