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I sampled 1000 people in 2018 and then 1000 people in 2019. For brand A, 5% of participants like the brand in 2018, and 8% of participants like the brand in 2019. For brand B, 25% of participants like the brand in 2018, and 29% of participants like the brand in 2019.

So people who like the brand grow 3% for Brand A, and 4% for Brand B, and I want to know if this 1% difference is significant or not, what's the right method to do the test?

Thank you!

Sean Lu
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  • I think I figured it out. As long as 3% and 4% are statistically significant, then the difference is significant. So a two proportion Z test will do the work. – Sean Lu Feb 03 '20 at 17:46

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