DAT QR Section: Statistics

[torobcheh21]

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So i've taken the DAT once before, and I'm going to be retaking it again soon. I remember having about 2/3 questions about statistics and I was wondering if anyone knows of a good website that explains the basics...things like p value, if something is significant or not, etc.

I took stats in college but it's been a while and I don't remember much.

Any ideas are greatly appreciated

 

[Msmouth]

So i've taken the DAT once before, and I'm going to be retaking it again soon. I remember having about 2/3 questions about statistics and I was wondering if anyone knows of a good website that explains the basics...things like p value, if something is significant or not, etc.

I took stats in college but it's been a while and I don't remember much.

Any ideas are greatly appreciated

Have you tried Youtube or Khan Academy? I found some good tutorials for stats on youtube and they were often better than my professor!

 

[torobcheh21]

i've seen a couple videos but nothing that great. i was looking for for like a webpage with everything broken down...i was just curious if anyone has found something like this

thanks

 

[torobcheh21]

can someone at least explain what p-value means and how it has come up in a question they've seen...

 

[torobcheh21]

Can someone explain a question like this?

A student runs five experiments and obtains the following p-values for the results: 0.065,0.072,0.084,0.056,0.099. What significance level would ensure that the student rejects the null hypothesis only once?

Answer choices are 5%, 6%, 7%, 8%, and 9%

Can someone paaalease break down what this p-value stuff really means?

 

[Kobebucsfan]

Can someone explain a question like this?

A student runs five experiments and obtains the following p-values for the results: 0.065,0.072,0.084,0.056,0.099. What significance level would ensure that the student rejects the null hypothesis only once?

Answer choices are 5%, 6%, 7%, 8%, and 9%

Can someone paaalease break down what this p-value stuff really means?

oh gawd, i dont want these on my DAT.

 

[jaymin8]

Can someone explain a question like this?

A student runs five experiments and obtains the following p-values for the results: 0.065,0.072,0.084,0.056,0.099. What significance level would ensure that the student rejects the null hypothesis only once?

Answer choices are 5%, 6%, 7%, 8%, and 9%

Can someone paaalease break down what this p-value stuff really means?

Is the answer 7%? If it is I would be more than glad to break it down for you!!!

 

[torobcheh21]

it's 6...

 

[bluemoon27]

Are you sure answer is 6 or is the smallest value actually 0.065? There may be a typo on the question or the answer.

I remember taking stats and based on the values given, I also agree that the answer is 7%. Basically, what I memorized from my bio class was that when the "p is low, then the null has to go" (low as compared to alpha or the level of significance). I am not a genius at stats either, but I just know that this is what you do from my experience in stats and bio labs.

So here, 0.065 or 6.5% is the p and its less than 7% (the alpha or significance), so in this case, the null will be rejected. But if we look at the other p values, they are bigger than the significance level, in which case, we cannot reject the null hypothesis.

Hope this helps.

 

[jaymin8]

Are you sure answer is 6 or is the smallest value actually 0.065? There may be a typo on the question or the answer.

I remember taking stats and based on the values given, I also agree that the answer is 7%. Basically, what I memorized from my bio class was that when the "p is low, then the null has to go" (low as compared to alpha or the level of significance). I am not a genius at stats either, but I just know that this is what you do from my experience in stats and bio labs.

So here, 0.065 or 6.5% is the p and its less than 7% (the alpha or significance), so in this case, the null will be rejected. But if we look at the other p values, they are bigger than the significance level, in which case, we cannot reject the null hypothesis.

Hope this helps.

👍

I think it was 7 as well (for the same reason).

 

[bluemoon27]

Oh whoops!! I'm sorry I just realized my mistake...look closely the smallest p in the list is actually 0.056. I just noticed that, so yes the answer is 6%.

Process of solving these questions: look at the smallest p value from the list given and match it with the smallest alpha or significance that is still bigger than p and viola! Hope I helped 🙂

 

[torobcheh21]

Process of solving these questions: look at the smallest p value from the list given and match it with the smallest alpha or significance that is still bigger than p and viola! Hope I helped 🙂

thank you guys...for the part where you said "match it with the smallest alpha or significance that is still bigger than p," what do you mean? What is the alpha/significance you're talking about?

thanks

 

[bluemoon27]

the answer choices they gave you, those are the alpha or significance levels. you want the p to be less than the alpha.

overhere, you were choosing the smallest alpha that was bigger than the p value (smallest p value)..

http://en.wikipedia.org/wiki/P-value

look at this website for more info on this, it does get a little technical, but it will give you a bit more in depth answer as to what p and alpha are 🙂