Science & Mathematics - 12 July 2006

There is much genetic evidence of all humans originating from Africa 100 000 to 200 000 years ago. A component of this evidence is the increased genetic diversity of groups closer to central Africa, and the diminishing genetic diversity the farther any group is from central Africa. Is there a study which determines exactly where in current Africa (perhaps somewhere in Kenya) there is the highest genetic diversity per 10 000 people? This might suggest a more precise geographic origin of all modern people. (of course there could be many confounding factors, such as the original group having maximal diversity having migrated en masse at some point to an adjacent area).

2006-07-12 10:52:04 · 3 answers · asked by garth_d 1 in Biology

Mel's diner has been surbeying their customers for the past couple of years about their dining experience in the restaurant. the survey uses a scale of one to five, five being best to indicate customer satisfaction. Mel's customer satisfaction averaged 2.5 last year, but this year it is 2.9. is the difference statistically significant? and is this pa parametric or nonparametric?

2006-07-12 10:51:56 · 4 answers · asked by authorknight1 1 in Mathematics

the reason am asking is because in my science class, the profesor ask if we flush the tolilet the water goes donw to the right side but if we flush the toilet in brazil or argentina and they are on the oposite site the water goes then to the left?

2006-07-12 10:48:18 · 8 answers · asked by Anonymous in Geography

a.volts
b.amperes
c.watts
d.ohms

2006-07-12 10:47:51 · 10 answers · asked by Anonymous in Other - Science

a.direct
b.alternating
c.neutral
d.electromagnetic

2006-07-12 10:46:50 · 13 answers · asked by Anonymous in Other - Science

if you have to find if a 3digit number is divivisable by 3, i.e. 345 or 696 add the numbers up then divide by 3 i.e. 345 = 13 not divisable 696= 21 / 3 equals 7 so it can be devided by 3


haha no real use just crap

2006-07-12 10:46:21 · 12 answers · asked by Anonymous in Mathematics

2006-07-12 10:46:18 · 3 answers · asked by etzatlan 1 in Mathematics

The idea of randomness is abstract but has important applications in statistics, probability, numerical analysis, physics, and all the natural sciences. Quantum-mechanical descriptions involve probability distributions necessitating the idea of randomness; radioactive decay may be understood to occur in a predictable macroscopic way, but with an element of randomness in terms of an individual particle's timing of decay. Is it possible to generate a "true" random number, or are existing random number generators or algorithms always "pseudo-random"? Has anyone thought of using naturalistic observation to generate "true" random numbers; i.e. assuming the moment of decay for a particle is truly random, and monitoring decay rates systematically so as to generate a set of random numbers.
Maybe the terminology could be paradoxical, for example maybe the sequence of digits in a decimal expansion of an irrational number is "truly random" but is also precisely determinable.

2006-07-12 10:44:36 · 9 answers · asked by garth_d 1 in Mathematics

a.quantity,rate
b.rate,quantity
c.voltage,resistance
d.quality,quantity

2006-07-12 10:43:57 · 10 answers · asked by Anonymous in Other - Science

a.boost the current flow to the appliance
b.prevent short circiuts
c.prevent electrical shocks
d.allow for variable speed operation

2006-07-12 10:40:52 · 16 answers · asked by Anonymous in Other - Science

If nitrogen is colder, please tell me what else is colder than liquid nitrogen.

2006-07-12 10:39:42 · 7 answers · asked by Anonymous in Chemistry

2006-07-12 10:39:07 · 8 answers · asked by Anonymous in Other - Science

and would it do it before the box has been opened by an external viewer?

schrodingers cat in a box experiment states that the cat is in a superposition of states until the box is opened and observed, then it "decides" wether to be alive or dead as a result of the release of the radioactive particle.

at what point does the intelligence of the observer come into the equation? would mechanically opening the box and placing a stethoscope and tape recorder against the cats chest be enough to collapse the probability wave and determine the state of the cat? or does the observer have to be able to intelligently interpret the state of the cat?

and if the observer has to be intelligent, not purely mechanical, can the cat posess enough intelligence to collapse the wave, making the whole paradox pointless?

2006-07-12 10:34:11 · 12 answers · asked by top_cat_1972 2 in Physics

2006-07-12 10:34:02 · 25 answers · asked by jessica 1 in Astronomy & Space

2006-07-12 10:32:34 · 17 answers · asked by Anonymous in Mathematics

2006-07-12 10:32:30 · 2 answers · asked by littleblanket 4 in Geography

Shouldn't people in relationships be worried about being pushed out of the relationship by someone else just like in, let's say, a S N2 reaction? For example, the nucleophile appears and the bond between the carbon chain and alkyl halide are broken to produce a new bond between the nucleophile and carbon chain while the alkyl halide is forced out on its own (but it does have a new pair of electrons I suppose...).

2006-07-12 10:28:12 · 5 answers · asked by aanstalokaniskiodov_nikolai 5 in Chemistry

2006-07-12 10:27:48 · 12 answers · asked by Anonymous in Engineering

2006-07-12 10:25:47 · 7 answers · asked by Anonymous in Other - Science

II have a papaya plant that flowers like a male plant however it has on two fruit hanging down from it.

2006-07-12 10:22:05 · 9 answers · asked by mamacita 1 in Botany

If 'no', how can their outputs be combined?

2006-07-12 10:21:55 · 6 answers · asked by Tom H 1 in Engineering

Linda is making wooden toys for the next arts and craft sale. Each toy costs Linda $1.80 to make. If she sells the toys for $3.00 each, how many will she have to sell to make a profit of exactly $36.00?

2006-07-12 10:20:42 · 23 answers · asked by janellieluvu 2 in Mathematics

2006-07-12 10:20:40 · 9 answers · asked by Rockford 7 in Medicine

2006-07-12 10:19:15 · 5 answers · asked by J-Z 1 in Biology

2006-07-12 10:19:11 · 18 answers · asked by P 1 in Other - Science

This is a real question...

2006-07-12 10:15:03 · 21 answers · asked by Lisa M 1 in Engineering

Why is it so muggy after it rains,most of the time?
It's werid,do u kno why?

2006-07-12 10:12:35 · 8 answers · asked by Jeremy 6 in Weather

2006-07-12 10:12:30 · 18 answers · asked by The Skinny 1 in Physics

have exam tommorow plz help!!!

2006-07-12 10:10:22 · 5 answers · asked by Anonymous in Biology

the product of 3 less than twice x and 2 more than the quantity 3 times x

2006-07-12 10:08:19 · 9 answers · asked by janellieluvu 2 in Mathematics