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Bio question help


Hassan
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I don't understand the markscheme for this question. For the student t test i learned that if the t-test statistic is greater than p = 0.05 then you reject the null hypothesis. But this markcheme says the opposite.  It says you accept. 

 

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Further_Maths_Student
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If the probability of the test statistic is less than the significance level (0.05) you always reject null hypothesis. That's the general rule with hypothesis tests. Not sure where you got greater than from

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Hassan
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@further_maths_student 

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so is this wrong then? 

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Further_Maths_Student
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@hassan 

Yh definitely a typo. You can tell, due to the ending as well. 

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Hassan
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@further_maths_student 

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The revision guide says the same tho. Im very confused 

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Further_Maths_Student
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@hassan

Ah, I understand the problem. The latest 2 screenshots you've sent me aren't incorrect - but also the mark scheme you posted in original question is not incorrect either.

Ignore when I said it was a typo.

Basically you can do hypothesis tests in 2 different ways.

One where you work out the probability of the test statisitic (known as the p-value). If this is less than the significance level, then you reject the null hypothesis.

But the other one is where you work out the confidence interval. If the test statistic falls outside of this region, you reject the null hypothesis.

The mark scheme seems to be referring to the first method, whereas your last 2 screenshots are referring to the second method.

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Hassan
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@further_maths_student how do you know which method the question is referring to?

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Further_Maths_Student
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@hassan

The question is referring to the 1st method - since the table has "p-values". This is the probability of the test statistic.

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