Mathematics - 16 November 2007

2007-11-16 15:07:32 · 9 answers · asked by poornima s 1

2007-11-16 15:03:55 · 3 answers · asked by Anonymous

2007-11-16 14:30:58 · 5 answers · asked by RedSparkle 1

I can not seem to find the right answer!!!

2007-11-16 14:28:53 · 5 answers · asked by RedSparkle 1

Use integration by parts to evaluate the definite integral. Integrate from 1 to e.
4 t^2 ln(t) dt

2007-11-16 14:25:09 · 2 answers · asked by sportzblock 1

According to this page:
http://mathworld.wolfram.com/StandardError.html

It says: "It therefore estimates the standard deviation of the sample mean based on the population mean."

So for example, if I have an entire population of 5 people, their age is {8,6,7,1,5}, then its stddev is about 2.702 and mean is 5.4

If I take random sample of size 3, maybe I will come up with {8,1,5}, then its stddev is about 3.512, mean is 4.667

As I increase the size of the sample and finally come to 5, that is, the sample is exactly equal to the entire poplution in this example. Then the standard error of the mean between [the sample] and [the entire population] should theoretically be zero.

But when I use this formula SE = σ/sqrt(n),
Since I already know the stddev of the entire population, which is 2.702 and I also know the size of the sample is now 5.
Substituting these values into the formula:
SE=2.702/sqrt(5)=1.208

The SE is not equal to zero. Why?

Thanks a lot.

2007-11-16 14:09:21 · 3 answers · asked by I need answers 1

there is a jogging course where they run one lap. person A ran at the rate of 120meters/minutes. person B ran at a rate of 100meters/minute. As a result, person A finished one lap 3 minutes faster than person B. How many meters are there in one lap around the jogging course?

2007-11-16 13:58:08 · 4 answers · asked by Osamu Miyawaki 1

a football team snaps the ball from their 10 yard line. The quarterback throws to a receiver who lined up 20 yards to the right of the quarterback and ran straight downfield. If the pass was 25 yards, how far downfield was the receiver when he caught the ball?

2007-11-16 13:57:32 · 2 answers · asked by sandee 2

name a fraction between 0 and 1/10 whose numerator is not 1. Explain.

2007-11-16 13:53:50 · 18 answers · asked by PacMan 2

I thought it would be on the triangle....but i just need a second opinion

2007-11-16 13:41:17 · 5 answers · asked by Shannen L 3

Using the numbers 1 through 9, form 3 rows of 4, each adding to 17.

2007-11-16 13:32:23 · 2 answers · asked by jasmine♥ 2

Heys guys I have another question dealing with logs. How would you evaluate this question?

log base 3 of (27 * 81^(1/3) ) + log base 5 of (125 * 5^(1/4) )

Answer: 72/11

Any help would be greatly appreciated!

2007-11-16 13:23:56 · 6 answers · asked by s_j_sawyer 3

integrate: arctan(1/x) dx

2007-11-16 13:21:55 · 2 answers · asked by Anonymous

2007-11-16 13:19:40 · 1 answers · asked by Ur Mom 2

find the inverse of
g(x)=3/(x^2+2x)

2007-11-16 13:11:59 · 4 answers · asked by wzerocx 2

evaluate the integral from 0 to 1 at x^2(sqrt[4]{e^x}) dx

To clarify the notation of the problem you are solving. The number 4 after the sqrt means its ^4sqrt(e^x) . It is the fourth root of e^x

2007-11-16 13:03:09 · 4 answers · asked by sportzblock 1

A builder intends to construct a storage shed having a volume of 900 ft^3. a flaf roof, and a rectangular base whose width is three-fourths the length. The cost per square foot of the materials is $4 for the floor, $6 for the sides, and $3 for the roof. What dimensions will minimize the cost?

2007-11-16 12:58:49 · 3 answers · asked by deadman 2

There is an answer...

2007-11-16 12:56:20 · 7 answers · asked by Cookie. 2

ok what i'm looking for is...
two people have to pick 2 numbers from 1 thru 150.
say 2 of the 150 is blue and the other 148 are white.
what are the odds that the two people will pick the 2 blue on their first try? or i just need the equation and i will figure it out...thanks!

2007-11-16 12:54:18 · 4 answers · asked by na cho baby 3

Evaluate the indefinite integral
{x + 1} / {x^2 + 2 x} dx

2007-11-16 12:30:17 · 5 answers · asked by sportzblock 1

Yreka, California, being a town founded by mathematicians, is a town with East-West streets numbered 1 through n and North-South Avenues numbered 1 through m. A taxi cab picks you up at the corner of 1st Avenue and 1st street, and you wish to be dropped off at the corner of mth avenue and nth street. Since you are a smart student, you are obviously not going to permit the cab driver to drive longer than the necessary (n − 1) + (m − 1) blocks and charge you more than the minimum fare.
In other words, the cabby must always be increasing his street number or his avenue number. Suppose there is an accident at the intersection of street i and avenue j, for some i,j where 1 < i < n and 1 < j < m. How many routes can the cab driver take to get you to your destination while avoiding the intersection with the accident? Justify your answer.

2007-11-16 12:23:22 · 2 answers · asked by David 2

2007-11-16 12:13:21 · 13 answers · asked by noreagared 1

Please help me! What fraction is between 1/3 and 2/3? And explain how you found the answer?

2007-11-16 12:11:07 · 5 answers · asked by omg 2

2007-11-16 12:05:35 · 6 answers · asked by Anonymous

A)x^2-x-1=0 B)x^2-2=0 C)x^2+x+1=0 D)x^2-1=0

2007-11-16 12:04:03 · 7 answers · asked by Anonymous

2007-11-16 12:00:43 · 7 answers · asked by Anonymous

Let A, B, and C be independent uniform random variables on the interval (0,1). Show that the probability that AB is greater than C^2 is 5/9.

2007-11-16 11:59:57 · 1 answers · asked by cornzxo 1

Why doesnt this work? Do not think of the question in any other terms than the way it is presented:

3 brothers pay $10 each for a room for a night.
total $30

Bellhop returns 5 of the $30
each brother keeps a buck and gives the bellhop 2. This reduces each brothers cost by $1 to $9 for a total of $27, bell hop got 2 for a toal of 29 what happened to the 1?

2007-11-16 11:59:55 · 10 answers · asked by roguetrader12002 4

(a) pure water

(b) 0.22 M KBr solution

(c) 0.12 M Pb(NO3)2 solution

2007-11-16 11:46:45 · 1 answers · asked by Andrew B 2

8x^3-6x^2+2x/4x+1

2007-11-16 11:26:00 · 5 answers · asked by Anonymous