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(upbeat synth music)
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- [Instructor] In the previous movie
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I gave you a challenge to create an alternative hypothesis.
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You want to know if an ad campaign was effective.
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And the question was whether sales
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for ad recipients increased by at least 10%.
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I invited you to create a null hypothesis
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and alternative hypothesis that examines the question
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in the second point.
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And then also identify if your hypothesis
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is one tailed or two tailed, and whether you can test it.
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So here's how I might approach the problem.
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The null hypothesis says, "Advertising did not increase
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sales by 10% or more".
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In other words, there was no effect.
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The alternative hypothesis says, "Advertising increased
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sales by 10% or more".
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Also this alternative hypothesis is directional.
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We are testing for an increase.
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And it can be tested by analyzing
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sales data from ad viewers.
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As long as you are collecting the data that you need
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you'll be able to identify individuals who saw the ads
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and whether or not they're spending increased
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over the time period that you were measuring.
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I hope you had fun with this challenge
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and that it prepares you to ask interesting
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and useful questions about your data.
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