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May be it's what you guys said for problem 1 of sheet, but I would like to clarify a bit. We have $80$ people that whatched the clip. Among these 80 people, $30\%$ are interested by the product. Among the 120 people that didn't see the clip, $\frac{24}{120}$ are interested by the product. So, at the end, $$\frac{0.3}{24/120}\approx 1.5,$$ what mean that $$\frac{\text{Proportion of people that saw and the clip, like the product} }{\text{Proportion of people that didn't see the clip, like the product}}\approx 1.5,$$ In other words, seing the clip increase your interest on the product of $50\%$.
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Thu, 25 Oct 2018 17:01 GMT