School and Work

"If you performed the test and the value was 2.5 and your critical value at 95% was 2.3 what would you conclude about the null hypothesis?"

Can you help me with this question? I have solved similar ones before but the critical value was at 5% and I got confused. Should i still reject the Null h?

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Home >All Categories > Science & Mathematics >Physics >Open Question Mike Joe Member since:June 07, 2011Total points:90 (Level 1)A particle, with q = –50 C, moves in a region of uniform field along a
helical path (radius = 2.0 cm, pitch = 5.0 cm) as shown. What is the angle between the
velocity of the particle and the magnetic field?Answer Question

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In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 13 patients using the drug is selected. Find the probability that:

(A) exactly two will have this mild side effect
(B) at least three will have this mild side effect.

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Home >All Categories > Science & Mathematics >Zoology >Open Question Jaya222 Member since:April 10, 2009Total points:168 (Level 1)I already saw someone already posted this question and i'm guesssing there's a LOT, but i need an approximate number for school! PLEASE ANSWER MY QUESTION!!!!!!!!!Answer Question

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A. 187.5%
B. 1.375%
C. 1.875%
D. 137.5%

thank you!!

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Home >All Categories > Science & Mathematics >Physics >Open Question MrLazy Member since:February 11, 2008Total points:597 (Level 2)I know there are several theories, but I can't find any when I researched.. So do you people know any theories (with sources)?Answer Question

by Liekgj Hurryth Member since:June 03, 2011Total points:133 (Level 1)Since a black hole is generated by a star of masses billions times the sun as they approach their end and go supernova and collapse.Due to the gravitational force being inevitably strong, nothing; not even light, can escape. Thus over a period of millions yet billions of years it will continue to suck in everything around it and keep other objects orbiting around their event horizon at which you cross that point - there is no return.... As a result, the black hole will be getting larger and emitting more light from the event horizons peak. This is how physicists detect black holes as they cannot be seen due to being black and emitting no light, so we observe the wobbles and orbits of the surrounding objects. Once a black hole has formed, it can continue to grow by absorbing additional matter and any black hole will continually absorb gas and interstellar dust from its direct surroundings and from cosmic background radiation. This is the initial process through which supermassive black holes seem to have grown. Super-massive black holes can get real big - it could be as large as the width of our solarsystem, doubled. hope this enhances your knowledge in black holes. :)

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Home >All Categories > Science & Mathematics >Medicine >Open Question Brennan Ball Member since:March 07, 2011Total points:88 (Level 1)My doctor told me that I need to take 1000 mcg of B12 per day. This seems high, as the only vitamin supplements I can find are for 50 mcg. She also mentioned that I have low "good cholesterol". What does all of this mean? Am I in danger?Answer Question

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Home >All Categories > Science & Mathematics >Chemistry >Open Question Dummets Member since:March 30, 2007Total points:37 (Level 1)Question says it all, however I am talking about the formal charge of an SO3 with sulfur attached to all of the oxygens by single bondsThe answer is either -2, -1, 0 +1, +29 minutes ago

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by mazar304... Member since:November 25, 2007Total points:2,253 (Level 3)

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This might very well be a dumb question. I'm reading up for this internship I have in a couple of weeks, and the papers I'm studying keep mentioning something called a "model membrane." the internship is based on researching the biophysics lipid membranes. here are a couple of sentences that confused me...

"During the last years, some of the physical properties of the plasma membrane have been studied with model membranes that mimic the lipid composition of rafts. Model membranes are still far away from representing the intricacy found in cells, but they constitute simplistic systems that can help understanding the principles of the processes that happen in cellular membranes."

it seems that this is saying "model membranes" are not membranes from real cells. the only other thing I could think of would be your basic, plastic cell membrane model, but i don't think that's what theyre referring to.

could anyone tell me what is meant by "model membranes"? thanks!

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Home >All Categories > Science & Mathematics >Mathematics >Open Question XoCutter... Member since:January 07, 2011Total points:250 (Level 2)I need to know the origin of all of them? Like a historical fact. IE: "Percent, means Per-One hundred. Cent= Onehundred, Centa-pede. etc."
I can't find any historical facts D: Please help with all?Answer Question

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Balanced equation:
C11H24 + 17 O2 --> 11 CO2 + 12 H2O

The hydrocarbon is undecane

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Well, over consumption leads to the need to extract more resources from our planet.
It also leads to lots of methane gas and co2 being exposed to be put into the atmosphere.

What are you're thoughts?

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Find the mean and standard deviation of the following probability distribution:
x 1 2 3
P(x) 0.2 0.7 0.1

Please show all of your work so i can better understand please

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Sorry. That's all genetics.There was a rumor that hot chocolate helps..but don't believe that. Fatter people tend to have biqqer boobs...but sometimes your metabloism interferes with that.Just like yourself for who YOU are. Havinq big boobs doesn't make you who you are. If people make fun of you,ignore them!Your body will develop when it needs to.

Hope I Helped ?

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