# hypothesis testing - Maths Year 1 Stats

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#1
For this question, why is it that P(X>=4), and why not P(X>4)?
I keep getting this wrong for every question.

Thanks.

Last edited by jamesmunk844; 1 month ago
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1 month ago
#2
(Original post by jamesmunk844)
For this question, why is it that P(X>=4), and why not P(X>4)?
I keep getting this wrong for every question.

Thanks.
The purpose of the hypothesis test is to test whether the result obtained falls within a tail of the probability distribution which, taken as a whole, has a probability of less than the significance level. The result obtained was X=4. The tail that includes X=4 is X>=4. So we have to check P(X >= 4) against the significance level 0.05.
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