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User avatar #4842 - mcpimpin (08/14/2015) [-]
Anyone know why your dick gets almost unbearably sensitive after ejaculation? I've always wondered but never found out.
User avatar #4848 to #4842 - drastronomy (08/19/2015) [-]
Its called an STI
User avatar #4844 to #4842 - altaccusedforfap (08/15/2015) [-]
like, painful sensitive, or what do you mean?
User avatar #4841 - jomgor (08/14/2015) [-]
There are only 7 species of sea turtle.
User avatar #4856 to #4841 - raeptiemx (08/23/2015) [-]
8, you forgot mine turtle MINE TURTLE (asdfmovie song)
User avatar #4840 - jaytothadee ONLINE (08/13/2015) [-]
Ok say In 75 years when im like 90 hopefully... I want to explore space. If i had enough money by then what would be the chance they could send me on a one way trip out really far and i document everything about the trip untill i die?
User avatar #4946 to #4840 - oosime (09/29/2015) [-]

it would make way more sense to send an unmanned probe. no need for food/water, not horrendous if something goes wrong, higher reliability, will last longer, no need for radiation shielding... it sucks, but robots are just better at that sort of thing.
User avatar #4891 to #4840 - atoaster (09/10/2015) [-]
Why would they use you if they could have a unmanned drone or something?

Also, wouldn't you rather spend your last days with family or something?
User avatar #4860 to #4840 - Elk (08/24/2015) [-]
User avatar #4839 - deathtothezed (08/12/2015) [-]
Hey could y'all help me find the animation with a bear and rabbit at the beginning then it goes into this whole what is life sequence? It was posted on FJ a couple of days ago.
#4837 - themarineelite (08/11/2015) [-]
For some reason I've started watching tornado videos again.
User avatar #4836 - supahsayin (08/10/2015) [-]
have there been any pictures of a cooled dead star? I wanna see that.
User avatar #4838 to #4836 - skoldpaddacommala (08/12/2015) [-]
There are 3 classifications of "cool" stellar remanents i can think of...
White Dwarf Star: I think they get down to around 3000K

Brown Dwarf Star: a bit disputed to be considered stars by some, but I heard they found one that had a surface temp of only 80F.

Black Dwarf Star: theoretically the final stage of some white dwarves, these stars have expended most of their energy and blend in to the cosmic background radiation, which would make them very difficult to find and observe outside of gravitational influence. Oh, and they won't begin to show up for a few billion years.

So Google image search this guys.
#4831 - gayboard (08/06/2015) [-]
yo what kinda spider is this
User avatar #4829 - mrstraw (08/06/2015) [-]
If a human has an injury to his intestines that caused bleeding how long would they have before the intestinal bacteria began to affect them or would it not be a problem?
User avatar #4835 to #4829 - sugoi ONLINE (08/07/2015) [-]
They will die in a few hours due to necrosis and the whole shit rubbing in your wound.
#4825 - flflfl (08/05/2015) [-]
when the sun dies and swallows us, what will happen to all the metal? will it metal where it is or would the sun be hot enough to evaporate it
User avatar #4827 to #4825 - Blackrain (08/05/2015) [-]
The intense energy and heat that is generated by the sun, especially when it expands to a Red giant will "vaporize" everything on Earth.
#4828 to #4827 - flflfl (08/05/2015) [-]
that sucks. i was hoping if we found a planet that was already swallowed by one to see how it would look with everything fused together because of the intense heat
#4826 to #4825 - anon (08/05/2015) [-]
The sun's temp is nearly 6000 K and a lot of metals have a boiling point of ~3000 K, so it's probably safe to say they'll evaporate (unless there's something involved with plasma, but I'm not familiar enough to say anything about that).
#4822 - flflfl (08/03/2015) [-]
if someone sweated in their sleep for a couple of nights, why would their shirt smell like vineger
User avatar #4823 to #4822 - theism (08/03/2015) [-]
Bacteria in the sweat produce propionic acid, which is the source of the smell.
#4824 to #4823 - flflfl (08/03/2015) [-]
could explain the acne
User avatar #4820 - zonetransferrer ONLINE (08/02/2015) [-]
so does any of you work with GAMESS? program for calculating quantum chemistry?
User avatar #4816 - sideism (08/02/2015) [-]
recently I read that semen is good for your skin, does anybody have experience with this and can give me advice before I do it?
User avatar #4849 to #4816 - drastronomy (08/19/2015) [-]
Horse semen is the best stuff i hear
User avatar #4817 to #4816 - advice (08/02/2015) [-]
you just want an excuse for getting a boyfriend, don't you OP?
User avatar #4805 - theism (07/30/2015) [-]
Is it possible that light doesn't have the maximum velocity of anything but rather the maximum momentum?
User avatar #4813 to #4805 - subtard (07/30/2015) [-]
E^2 = (pc)^2 + (mc^2)^2
The (pc)^2 term only ever matters when approaching the speed of light, which is makes the rest boil down to E=mc^2 where m=mass at rest. However photons have no mass at rest which means E = pc. P comes from relativistic momentum which is equal to Planck's constant divided by the light's wavelength. The average visible light has somewhere around 10^-27 kg*m/s momentum from this.

Compare that to some example values from this site www.batesville.k12.in.us/physics/PhyNet/Mechanics/Relativity/relativistic_momentum.html to show that light really has negligible momentum.
User avatar #4803 - theism (07/28/2015) [-]
What environmental conditions would reduce the fire activity of a high oxygen atmosphere? The best I can think of is atmospheric moisture,
User avatar #4800 - theism (07/25/2015) [-]
What does a t-rex even do with it's arms? They aren't much use for claws or manipulation so whats the point?
#4797 - anon (07/23/2015) [-]
So this is labeled as "Wavellite on matrix"
What does it mean when they say "on matrix"? I looked it up but it still didn't make sense to me. Can someone help?
User avatar #4818 to #4797 - skunks (08/02/2015) [-]
Matrix in geological terms just means whatever surface something has formed on.

A matrix of what looks like granite in this case.
User avatar #4794 - luigipimp (07/20/2015) [-]
i heard if time stopped, that you would be burned up by the friction of air molecules but wouldnt that mean you wouldnt be able to breathe since the air would stop flowing and not be able to move since the air molecules wouldnt move out of the way from displacement?
User avatar #4796 to #4794 - nought (07/23/2015) [-]
Time can't stop
If it could be stopped in an "instant" nothing would happen in the instant?
User avatar #4791 - ogcj (07/19/2015) [-]
Why climate change is a hoax
User avatar #4795 to #4791 - nought (07/23/2015) [-]
Not even worth opening the link
This is science not conspiracy
User avatar #4798 to #4795 - ogcj (07/23/2015) [-]
It's not science, Especially since they recently had to cancel an expedition in the antarctic that was going to study climate change because there was too much ice. One of the scientists on board said that he hasn't seen that many ice in over 20 years.
User avatar #4799 to #4798 - nought (07/23/2015) [-]
"wow there's so much ice here omg everyone look around it's all fake call if off boys" :^)
User avatar #4787 - ravenpt (07/18/2015) [-]
Hey. I need a little help with some hypothesis test that myself and a teacher of mine at uni disagree at. So here it goes:

A school director wants to start classes at saturday, but he will only do so if 80% of the students are willing to attend. With a degree of confidence of 95%, should the director start the classes at saturday?

Students that said they will attend: 288 of 400 (wich will make 0.72)

So I said that the director shouldn't start them because:

H0: p<=0.8 (The data indicates that there won't be enough students)
H1: p>0.8 (The data indicates that at least 80% of students will attend)

Since the outcome will be negative (0.72-0.8=-0.08) there is no chance the result can be positive, so H0 is accepted.

While she did the following:

H0: p=>0.8 (Students will attend the class)
H1: p < 0.8 (Students will not attend the class)

And in this one, H0 is also passed. But this last test only demonstrates that there isn't 95% of certainty that less than 80% will attend the class right? Am I going nuts?
#4792 to #4787 - smudgiemuffins ONLINE (07/19/2015) [-]
Quick note, null hypotheses cannot be set up like x<=n. They must be in the form x=n. The only valid operator for a null hypothesis is an equal sign. Also, your alternative hypothesis should be testing for whether or not p is actually lower than 0.8.

Your phrasing of the question was a tad ambiguous. Is the intent that the teacher has exactly 400 students, and 288 said they will definitely comes? That doesn't imply that the other 112 wont. Nor can we make a statement about them because the 288 who did answer do not in any way represent the 112 who didn't. If I were talking about this on a statistics test, I'd call it "response bias" to please the teacher and just say this is a bad survey.

Now, if the teacher has, say, ~4000 students and 400 random students responded. 288 said yes, 112 said no. Then it's quite easy. You've got a large, random sample thus the central limit theorem holds and z-procedures are valid. This yields a confidence interval of (.676, .764) at 95% confidence. Or in colloquial terms, we're pretty damn sure there are not a proportion of .8 students going to attend.

Or, what is in my opinion the better way to approach this test but less intuitive depending on what kind of stats class you're taking. A 95% percent confidence interval implies a level of significance at 5%. A 1-proportion z-test yields a p-value(not proportion, just to be clear) of 3.17*(10^-5). Meaning, by the level of significance and really any reasonable level of significance the H0 that p=0.8 should be rejected.
#4814 to #4792 - minutes ONLINE (08/01/2015) [-]
"The only valid operator for a null hypothesis is an equal sign"

Yeah no. H0 and H1 have to be incomplementary. H0: µ=4 and H1: µ>4 would completely ignore anything that is smaller than 4. You're mixing up one sided tests with two sided ones.

There are 3 possibilities: H0: µ=µ0 H1: µ=/=µ0 // H0: µ>=µ0 H1: µ<µ0 // H0: µ<=µ0 H1: µ>µ0

If you need proof I can give you a photograph of the book.
#4815 to #4814 - smudgiemuffins ONLINE (08/02/2015) [-]
My statistics teachers always through a big piss fit if I defined the null hypothesis any other way. Akin to not including the differential on your integrals. It doesn't preclude two tailed or one tailed tests, though.

H0: µ= µ0
H1: µ > µ0
is one sided

H0: µ = µ0
H1: µ =/= µ0
is two sided

Just a notation issue, the mathematics is identical.
#4819 to #4815 - minutes ONLINE (08/02/2015) [-]
It's not. Again, these aren't incomplementary.
Maybe your teacher just mixed up something. I think 4 well known mathematicians and my not so well known prof. have a little more credibility than some teacher.

The book is Fahrmeir-Künstler-Pigeot-Tutz, 2011: Statistik. Der Weg zur Datenanalyse. Berlin: Springer.
#4821 to #4819 - smudgiemuffins ONLINE (08/02/2015) [-]
A random page from a book of a language I don't speak is mostly unhelpful.


A random example of a professor's notes for a stats class. You can follow it back a few times and see that it's a professor from the University of Minnesota. The point not being to suggest that you are necessarily wrong, but rather than this idea is not something I pulled out of my ass.

Once again, though, I stress that this is initial notation. The calculation requires the calculation of the T given by (x-µ0)/(s/sqrt(n)), as is stated in your book. The point of the hypothesis test is to then use this quantity and analyze the t-distribution to determine H1's validity. None of this requires the definition of H0. You're testing H1, not H0. If it puts it more succinctly, using a TI-84 to calculate this doesn't even require you to define H0, only H1. Because, as I said, you are testing H1.
#4778 - mrskulldude has deleted their comment [-]
User avatar #4789 to #4778 - djequalizee (07/19/2015) [-]
Put the batteries in
User avatar #4782 to #4778 - nimba (07/17/2015) [-]
put it in the toaster
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