# Find out how much you should spend based on math rather than hearsay.

4 replies
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OK, I always see questions in the forum asking how much you should spend testing an offer.

Rather than basing your budget on an answer from someone who may or may not know what they are talking about, try doing this:

Two Examples.

Example 1- How to determine the confidence interval of an already ran campaign.

Go to: Confidence Interval for Proportions Calculator

Now calculate your Confidence Internal (yes this is math but the website does it for you)

How to:

Step 1: Select your desired confidence level(I usually go with 90%)

Step 2: Let's say you ran a CPC test and had 100 clicks. Enter 100 into the sample size.

Step 3: Now let's say, from those 100 clicks you had 3 conversions.
Enter 3 into the observed survey result.

Now calculate.

In the example above, you can now determine that true population proportion ranges between .19% and 5.18%

Example 2 - How to estimate a desired sample size

Go here: Sample Size for Proportion Calculator

Step 1: Enter your desired confidence level (again, I usually use 90%)

Step 2: Enter your estimated conversion rate

Step 3: Enter your desired confidence interval (I typically use 2)

Now Calculate and you will see the minimum sample size needed.
• Great! Thanks a lot for sharing! Math always helps a lot. However, there are many subjective factors to be considered in a campaign, and, if I'm not wrong (maybe I am ), these numbers would apply if we were sure about the quality of the elements that we are using (ads, landing pages, etc), so we would use these tools to determine how much to spend to test the campaign and then we would know if it works or not. But what if the landing page is not good? Then I can follow these numbers and decide that the campaign isn't profitable, but I'd never know that my conversion rate would be better with a new landing page.

This is the reason why I think that tools can help, but they can never do everything for us, a campaign always needs the "human touch", a more subjective analysis.

William
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•  Originally Posted by williamrs Great! Thanks a lot for sharing! Math always helps a lot. However, there are many subjective factors to be considered in a campaign, and, if I'm not wrong (maybe I am ), these numbers would apply if we were sure about the quality of the elements that we are using (ads, landing pages, etc), so we would use these tools to determine how much to spend to test the campaign and then we would know if it works or not. But what if the landing page is not good? Then I can follow these numbers and decide that the campaign isn't profitable, but I'd never know that my conversion rate would be better with a new landing page. This is the reason why I think that tools can help, but they can never do everything for us, a campaign always needs the "human touch", a more subjective analysis. William
It will tell if you the campaign in its current format is working or not. It is still up to the IM to determine if the problem is the landing page, offer, etc.
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•  Originally Posted by SpendTooMuchTimeOnline It will tell if you the campaign in its current format is working or not. It is still up to the IM to determine if the problem is the landing page, offer, etc.
So, to improve landers, ads and offers we should split test, and to analyze the results accurately - instead of guessing based on hearsay - we can use this little calculator that complements the other ones nicely (courtesy of Perry Marshall).

:::SplitTester.com:::

This one will tell you the confidence level so that you can accurately determine which lander/ad/offer is winning your split test.
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• I love "scientificating" as much as possible. The more you can systematize your business based on objective inputs, the more reliably you can grow your business.

Of course there is subjectivity all over this business as many aspects involve creativity, but you can still base the subjectivity on formulas!
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