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Receive Your Free Sampling Error/Sample Size Estimator Card Today!
Keep one of these handy credit card sized estimators in your purse or wallet for use during meetings or when a quick reference is needed.
With these sample size estimator cards you can:
- Estimate the amount of error in your A/B split or multivarite test results at both the 90% and 95% confidence interval levels
- Determine how large of a sample is required to ensure your test will be readable, reliable and projectable
Each card comes with easy to follow instructions on the back of the card and is laminated for durability.
For example, the amount of error associated with a test response rate of 1.60% and a sample size of 10,000 is .21% -- implying the actual response
rate in rollout can be as low as 1.39% or as high as 1.81% with 90% probability (as shown in the red circle).
Get yours today, no obligation.
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To received your free sample size estimator card today, simply send a self-addressed #10 envelope with one affixed 39 cent stamp to:
Drake Direct
Sample Size Card Offer
225 East 46th Street, Penthouse D
New York, NY 10017
Please allow 2-4 weeks for delivery.
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