What is the most appropriate test to validate significance in the case I'm comparing multiple different groups? e.g.
I have different groups of ages (teenager, young, adult, elderly) and a conversion rate related to each of them in my website. How can I validate the differences in the conversion rates from a statistical point of view?
class size conversion
teenager 1000 3%
young 700 3.3%
adult 800 4.7%
elderly 300 2.3%