All language subtitles for 04 - Challenge Formulate and test a hypothesis

(quirky music)

- [Instructor] In this chapter I have described how to

formulate a hypothesis and also given an overview

of how to test it.

As a reminder, a hypothesis is an educated guess

about a relationship between two values in your data set.

The null hypothesis says that Factor A

has no effect on Factor B.

And the alternative hypothesis says that in fact

Factor A does affect Factor B.

The alternative hypothesis can be directional where you look

for less than or greater than, or non-directional

where you're looking for a difference of any kind

up or down from a particular value.

So in this movie, I would like to set a challenge,

which is to create an alternative hypothesis.

You want to know if an ad campaign was effective.

And the question is, did sales for ad recipients increase

by at least 10%?

So what I'd like you to do is to create a null hypothesis.

Create an alternative hypothesis that answers

the question that we're testing for.

And then identify if your hypothesis

is one-tailed or two-tailed,

and whether you can test it.

In the next movie I will show you one way

to approach this problem.