Dave needs 10 sales out of every 1,000 visitors to be profitable. He runs a test and gets 12 sales. How can he be 95% sure that this isn't just good luck, and that the site will continue to be profitable?
---
Profitable conversion rate = 10 / 1000
Profitable conversion rate = 1%
Visit this calculator: http://vassarstats.net/prop1.html
---
Using the laws of Expected Value, we would expect:
Number of expected sales = Visit x Per-Unique-User-Conversion-Rate
We know the visits. Dave's profitable conversion rate is 1%.
Number of sales to be profitable = 1,000 x 1%
Number of sales to be profitable = 10
Now this could be good, or it could be bad. Dave gets 4 sales for 1,000 visitors, should he be worried about this profit?
.
.
.
.
.
.
.
No. Dave is cool - 4 could still be profitable.
---
How to work this out for your numbers? Visit this calculator: http://vassarstats.net/prop1.html
---
Profitable conversion rate = 10 / 1000
Profitable conversion rate = 1%
Visit this calculator: http://vassarstats.net/prop1.html
---
Using the laws of Expected Value, we would expect:
Number of expected sales = Visit x Per-Unique-User-Conversion-Rate
We know the visits. Dave's profitable conversion rate is 1%.
Number of sales to be profitable = 1,000 x 1%
Number of sales to be profitable = 10
Now this could be good, or it could be bad. Dave gets 4 sales for 1,000 visitors, should he be worried about this profit?
.
.
.
.
.
.
.
No. Dave is cool - 4 could still be profitable.
---
How to work this out for your numbers? Visit this calculator: http://vassarstats.net/prop1.html
What do you think of this?