skip to navigationskip to main content

Business Helpsheets

Back to Helpsheets

Probability Chart of Results of Test Mailings

When you undertake a marketing activity that produces a result it would be great to know that if you repeated it, the same result would occur or if you did twice the amount, you would get twice the return and so on. Of course, there is no certainty. Nevertheless, the larger the sample size of the first test, the more confidently you can predict the results of additional marketing activities based on the probability of the result. The following table on the next page shows how to be 95% sure that additional mailings will produce a result within certain boundaries.

If the size of the test mailing is And the return on the test mailing is Then 95 chances out of 100, the return on the identical mailing on the whole list will be between If the size of the test mailing is And the return on the test mailing is Then 95 chances out of 100, the return on the identical mailing on the whole list will be between
100 1% 0 & 2.99% 250 1% 0 & 2.26%
100 2% 0 & 4.80% 250 2% 0.23% & 3.77%
100 3% 0 & 6.41% 250 3% 0.84% & 5.16%
100 4% 0.08% & 7.92% 250 4% 1.52% & 6.48%
100 5% 0.64% & 9.36% 250 5% 2.24% & 7.76%
100 10% 4.00% & 16.00% 250 10% 6.20% & 13.80%
100 20% 12.00% & 28.00% 250 20% 14.94% & 25.00%
500 1% 0.11% & 1.89% 1,000 1% 0.37% & 1.63%
500 2% 0.75% & 3.25% 1,000 2% 1.12% & 2.88%
500 3% 1.48% & 4.52% 1,000 3% 1.92% & 4.08%
500 4% 2.25% & 5.75% 1,000 4% 2.76% & 5.24%
500 5% 3.05% & 6.95% 1,000 5% 3.62% & 6.38%
500 10% 7.32% & 12.68% 1,000 10% 8.10% & 11.90%
500 20% 16.42% & 23.58% 1,000 20% 17.48% & 22.52%
2,000 1% 0.55% & 1.45% 5,000 1% 0.72% & 1.28%
2,000 2% 1.37% & 2.63% 5,000 2% 1.60% & 2.40%
2,000 3% 2.24% & 3.76% 5,000 3% 2.52% & 3.48%
2,000 4% 3.12% & 4.88% 5,000 4% 3.45% & 4.55%
2,000 5% 4.03% & 5.97% 5,000 5% 4.38% & 5.62%
2,000 10% 8.66% & 11.34% 5,000 10% 9.15% & 10.85%
2,000 20% 18.21% & 21.70% 5,000 20% 18.87% & 21.13%
10,000 1% 0.80% & 1.20% 100,000 1% 0.94 & 1.06%
10,000 2% 1.72% & 2.28% 100,000 2% 1.91% & 2.09%
10,000 3% 2.66% & 3.34% 100,000 3% 2.89% & 3.11%
10,000 4% 3.12% & 4.39% 100,000 4% 3.88% & 4.12%
10,000 5% 4.56% & 5.44% 100,000 5% 4.86% & 5.14%
10,000 10% 9.40% & 10.60% 100,000 10% 9.81% & 10.19%
10,000 20% 19.20% & 20.80% 100,000 20% 19.75% & 20.25%

How We Can Help You

We can assist you in setting up measurement systems to statistically predict the probability of future marketing activities.

Working with you

Whether you're starting from scratch or have been in business for years you'll benefit from working with Williams & Co advice on how to take you to the next level.

fixed-quote-man.jpg

About us

We work closely with our clients and act for a broad range of business....

business-advice-couple.jpg

Get in touch

Simple way to contact us. Just fill in a simple form.

free-consultation-couple.jpg

Our services

Find out details about what we can do
for you.

xero