Science & Mathematics - 23 November 2006

2006-11-23 08:58:08 · 13 answers · asked by Juan H 2 in Zoology

2006-11-23 08:58:06 · 36 answers · asked by cristian.t@btopenworld.com 1 in Zoology

I know it is 5n - something

2006-11-23 08:57:41 · 11 answers · asked by x1gemma1x 1 in Mathematics

Unbiased estimator & theta - Statistics - Normal distribution?

In class we said that S is an unbiased estimator of θ if E[S] = θ, otherwise it was biased, with bias = E[S] – θ. We would like to find an unbiased estimator of the area (A) of a square plate with sides of length L. Suppose that we make two independent measurements L(1), L(2) of the length of the sides of the plate. Suppose that L (I) is Normally distributed with mean L and variance σ^2. Let your first estimator of A be the square of the average length of the two measurements and let your second estimator be the average of the squares of the first measurement and the second measurement. That is,
S(1) = [0.5(L(1)+ L(2))]^2 and S(2) = [0.5(L^2(1) + L^2(2))]. Which of these estimators has the least bias? If both are biased, can you think of a third estimator that is unbiased?

Well, I know that if X and Y are two independent random variables then E[XY] = E[X]E[Y], and that VAR[X] = E[X2]-[E[X]]^2

Any ideas?

Thanks!

2006-11-23 08:57:22 · 1 answers · asked by abe_cooldude 1 in Mathematics

2006-11-23 08:54:09 · 5 answers · asked by Harsh 1 in Earth Sciences & Geology

2006-11-23 08:53:14 · 17 answers · asked by ranman293 1 in Engineering

for example the song would reflect how it feels to fly over the roofs into the bushes and tasting the berrys

2006-11-23 08:53:06 · 9 answers · asked by Anonymous in Zoology

2006-11-23 08:51:41 · 18 answers · asked by londra l 1 in Engineering

2006-11-23 08:51:03 · 14 answers · asked by gunsmoke_55_75 2 in Astronomy & Space

i dont understand it at all and i have to do a project figuring how many moles of something it takes to go around the earth or something like that but i don't understand what im supposed to do at all and im about to cry...haha its annoying i hate this!

2006-11-23 08:49:35 · 6 answers · asked by gradin_2007 1 in Chemistry

penguins live in very cold places. Why doesn't their blood freeze?

2006-11-23 08:47:17 · 8 answers · asked by gramatin24 2 in Earth Sciences & Geology

2006-11-23 08:45:31 · 3 answers · asked by Dan 1 in Mathematics

why does molten lava freeze as it moves further from a volcano

2006-11-23 08:45:22 · 10 answers · asked by gramatin24 2 in Earth Sciences & Geology

Not the music conductor but the conductor for Science, If you answer that please give me examples of a insulator if you do taht i will give you a best answer!

2006-11-23 08:45:16 · 11 answers · asked by Anonymous in Engineering

2006-11-23 08:44:14 · 6 answers · asked by drwho42avenger 1 in Physics

2006-11-23 08:43:35 · 3 answers · asked by Chi ^ 1 in Physics

I heard recently Nasa think its more like a moon. (i think)

2006-11-23 08:40:22 · 17 answers · asked by stelalief 1 in Astronomy & Space

2006-11-23 08:37:01 · 18 answers · asked by stelalief 1 in Astronomy & Space

2006-11-23 08:33:07 · 7 answers · asked by Coolkid81 3 in Mathematics

Explain the following: You add 100 mL of water to a 500-mL round-bottom flask and heat the water until it is boiling. You remove the heat, stopper the flask, and the boiling stops. You then run cool water over the neck of the flask, and the boiling begins again. It seems as though you are boiling water by cooling it.

2006-11-23 08:33:05 · 2 answers · asked by Anonymous in Chemistry

I need this information because my physics teacher didn't tell me.

2006-11-23 08:29:48 · 7 answers · asked by zoeychick67 1 in Physics

Using the square root property, solve for x

3x^2 + 2 = O

The book says the answer is plus/minus the (sq rt of 6)/3, but keep coming up with + or - sq. rt of (2/3). What am I doing wrong. Please show your work. Thanks!

2006-11-23 08:27:43 · 5 answers · asked by Inquisitor-2006 5 in Mathematics

2006-11-23 08:27:31 · 4 answers · asked by toephu@sbcglobal.net 2 in Astronomy & Space

Answers in plain basic english cus im very confused at the moment. Thanks

2006-11-23 08:26:00 · 4 answers · asked by Perfect-Angel84 2 in Chemistry

Question i have is: This experiment qualitatively analysed for component dyes. Explain what this means.

Please help i missed the class and dont understand. Can anyone answer this for me in basic plain english?

2006-11-23 08:23:38 · 2 answers · asked by Perfect-Angel84 2 in Chemistry

2006-11-23 08:22:14 · 8 answers · asked by Ron 1 in Mathematics

2006-11-23 08:21:51 · 48 answers · asked by ? 5 in Astronomy & Space

i wnat tto drink wine cuz i'm bored n lonely. i had wisdom teeth out monday and on penicillin. can i drink some wine/

2006-11-23 08:20:38 · 6 answers · asked by two_kee_kees 4 in Medicine

2006-11-23 08:18:50 · 1 answers · asked by reepecheep555 1 in Botany

how many computers costing $780 each can be bought for $18,720?

2006-11-23 08:15:58 · 17 answers · asked by babegirl 1 in Mathematics