For the Email Spying Example, you have said that when we wanted to test if email open rate was higher than 40%, the null hypothesis actually had to state the opposite. In that case: Null Hypothesis: Population Mean open rate <= 40 Alternative Hypothesis: Population Mean open rate > 40 However in the exercise you said “What if the question was: is the competitor open rate EXACTLY 40%?” and then the null hypothesis doesn’t state the opposite. Why is that?

I think this is because null hypothesis always includes equal to sign and hence population open rate is exactly 40% becomes the Null hypothesis. I would request faculty to answer this as I have the same doubt.

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Andrés Darío Adam

Last answered:

29 Sept 2022

Posted on:

02 Apr 2022

Please, help, this is so confusing!

in Statistics / Test for the mean. Population variance unknown

1 answers ( 0 marked as helpful)

Sandesh Deshkar

Posted on:

29 Sept 2022

Please, help, this is so confusing!

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