All language subtitles for 05 - Solution Formulate and test a hypothesis

(upbeat synth music)

- [Instructor] In the previous movie

I gave you a challenge to create an alternative hypothesis.

You want to know if an ad campaign was effective.

And the question was whether sales

for ad recipients increased by at least 10%.

I invited you to create a null hypothesis

and alternative hypothesis that examines the question

in the second point.

And then also identify if your hypothesis

is one tailed or two tailed, and whether you can test it.

So here's how I might approach the problem.

The null hypothesis says, "Advertising did not increase

sales by 10% or more".

In other words, there was no effect.

The alternative hypothesis says, "Advertising increased

sales by 10% or more".

Also this alternative hypothesis is directional.

We are testing for an increase.

And it can be tested by analyzing

sales data from ad viewers.

As long as you are collecting the data that you need

you'll be able to identify individuals who saw the ads

and whether or not they're spending increased

over the time period that you were measuring.

I hope you had fun with this challenge

and that it prepares you to ask interesting

and useful questions about your data.