new insecticide is advertised to kill more than 95% roaches upon contact. In a laboratory test, the insecticide was applied to 400 roaches and 384 died immediately after contact. Is this sufficient evidence to support the advertised claim?

Yes! The Commercial is telling the truth that the product kills a good amount, but they are lying when they say it kills 95%. Because it kills 96%!

Explanation:

This is a great question to be asking!

With is experiment, instead of killing 95% of the roaches in the laboratory, it killed 96%. But, it is strange that the commercial did not say 96%. But, to me, maybe that because 95% looks more appealing to the broad audience, instead of a higher number?

Anyways! Hahaha, sorry for getting off topic, but all you need to do to figure this out is to set up a division equation!

Because only 384/400 died, that would be the equation. And when plugging that into a calculator you get 96%.

Fun fact! If the product had killed only 380/400 roaches, then the commercial would be telling the truth.