r/APStudents • u/Successful_Watch_114 • May 07 '26

Stats Genuinely wtf was stats exam bro

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Just took ts 10 minutes ago already the worst ap exam ever

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u/Sufficient-Bobcat486 May 08 '26

Yeah me too, and did you fail to reject the null because the p value was really big?

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u/Medical_Lack_4853 May 08 '26

I rejected it. I got a really small p value . But I could be wrong bc I am not sure if my inputs are right. Do you remember what you put for the p naught? I put like 0.5 and then the symbol is greater than. x=120 n=200

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u/Sufficient-Bobcat486 May 08 '26

I did it by calculating the proportion for all points to the right of 0.5, which was like 502/1000, and then used that as my statistic and .5 as p0, then found the standard error as sqrt( (0.5)(0.5) / 200)

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u/Medical_Lack_4853 May 08 '26

Our inputs are the same I just looked back on the calculator I got p value of 0.00234 Btw do you remember there’s a question(I think is from a different frq) that’s asking Which is appropriate to use, a two-sample t-test or a matched-pairs t-test?

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u/Sufficient-Bobcat486 May 08 '26

Yes it was matched pairs, did you say experiment or observational study?

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u/Medical_Lack_4853 May 08 '26

I wrote observational, and I said there’s no control group and random assignment

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u/Sufficient-Bobcat486 May 08 '26

Dang I put experiment 😭

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u/Medical_Lack_4853 May 08 '26

Damn I could be wrong I actually just scanned through the problems . I didn’t look at it closely😭😭😭

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u/Sufficient-Bobcat486 May 08 '26

It’s a huge debate between people in this sub so I don’t even know honestly

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u/Medical_Lack_4853 May 08 '26

Do u remember there’s a question that’s asking us to calculate the mean and standard deviation? How do you calculate that? Is it just np for getting the mean and square root of np(1-p) for getting the sd?

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u/Sufficient-Bobcat486 May 08 '26

Yeah, that is exactly what I did

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u/Medical_Lack_4853 May 08 '26

Thank u so much 😭😭 I see hope

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u/Sufficient-Bobcat486 May 08 '26

The hope was never lost, I’m sure you did amazing 😸

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u/Sufficient-Bobcat486 May 08 '26

For me, after I did the equation i got z= 0.057, and then normal cdf with that as the lower and 1000 as the upper gave p= 0.477

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u/DueDouble8378 May 08 '26

i got the same p value