Means Definition and 288 Threads

Mentor note: Moved from a non-HW forum section, so missing the HW template When I was attending probability class, my math teacher said me that in the problems involving Case 1 'and' Case 2, I have to multiply probability of Case 1 and Case 2, while in the case of Case 1 'or' Case 2, I have to...

I have been studying that velocity = displacement / time. Now what if displacement / time always gives me same value - does it means that object is at rest as displacement is same then the body has not moved at all. So in above graph velocity is constant - ie displacement wrt to time is same...

For our class project we are to collect some data from two populations, summarize it in table and graphical form, and conduct at least two different hypothesis tests that use different procedures and construct two different confidence intervals. I wanted to summarize my plan here and ask for...

quating from Cosmological_principle How can one see that if the universe appears isotropic from any two locations it must also be homogeneous? And why would we need three points for a sphere? Thanks.

In ideal gas model, temperature is the measure of average kinetic energy of the gas molecules. If by some means the gas particles are accelerated to a very high speed in one direction, KE certainly increased, can we say the gas becomes hotter? Do we need to distinguish the random vibration KE...

I want to know in details what does the centric force meaning

I have a = {a1, a2, .., a1000}, where this set forms a distribution of photoelectrons (pe) seen by a particular photomultiplier tube (pmt) over 1000 repeated events. I then have N sets of these (N pmts), each containing 1000 pe values which I believe are indeed random and independent. So a, b...

i know the rules of finite expansion but i just want to know why do we need it and what does it mean ?

I was reading a book that said the Higgs Boson destroys itself within trillionth of a second, I really did not understand this, so what does it mean?

Homework Statement "Consider a standard uniform density. The mean for this density is .5 and the variance is 1 / 12. You sample 1,000 sample means where each sample mean is comprised of 100 observations. You take the standard deviation of the 1,000 sample means. About what number would you...

What is meant by diode polarity. If we do connect anode to positive and cathode to negative then its means it works on Forward Bias mode. I think positive means higher potential than negative, in other words, if positive terminal which is Anode is to be at 5 volts and negative terminal which is...

Hi! (Wave) I am looking at the following exercise: If $\{ x_n \}$ is a sequence of rationals, then this is a Cauchy sequence as for the p-norm, $| \cdot |_p$, if and only if : $$\lim_{n \to +\infty} |x_{n+1}-x_n|_p=0$$ That's what I have tried: $\lim_{n \to +\infty} |x_{n+1}-x_n|_p=0$ means...

Homework Statement Hello Everyone! I am having trouble with one of my questions it goes: It is claimed that fewer than 30% of Thunder Bay households have home delivery of the newspaper. To test this claim, a random sample of 390 Thunder Bay households reveals that only 95 get the paper...

Homework Statement The question is as follows: A man of mass 100kg is placed onto platform 1. The maximum weight that he can lift using this machine is twice his own weight (200kg*g). The mechanical advantage of the machine is constant. If the mass of the object is 100kg, 1) what is the...

I don't understand on how to get the answer of a certain problem in arithmetic series. formula/s: Arithmetic means An=A1+ (n-1)d Arithmetic series Sn=n/2 (A1+An) I understand on how to get the terms to these but when finding for: Find A1 if, S10= -20 , d= 4 & Find S12 if, 2+5+8+... I...

Y: 51 32 30 74 42 35 39 33 55 61 Y-hat: 49 35 29 72 44 32 38 36 57 60 Null hypothesis: mean y-hat = mean y Alternative hypothesis: not null hypothesis So I got as a t test 0 and I was wondering if I did something wrong because I never has this case happened to me.

Hello all, Consider 3 different samples. Each sample is independent. 1: 23, 25, 21, 22, 21, 22, 20, 23, 19, 22, 19, 21 2: 28, 27, 27, 29, 26, 29, 27, 30, 28, 27, 26, 29 3: 23, 20, 25, 21, 22, 23, 21, 20, 19, 20, 22, 21 I am being asked to test whether μ2 - μ1 = μ3 - μ2 with 99%...

Do we use imaginary numbers just in the intermediary steps of a predictive theory? For example, in QM, in order to make predictions in the real world, you square the wave function. The wave function might have have all the information, but in order to predict something you must operate on it to...

Hi , I understand the equation and calculation and stuffs. But I can't really visualise/understand.What it does?.And I have questions like 1)Why make it symmetry to do the calculations? 1)Will the medium /Dielectric between conductor 1 and 2 affect C11/C22.Or only C12? Thanks for your time

I'm reading the cross setion of p + 18O Total neutron production ftp://ftp.nrg.eu/pub/www/talys/tendl2013/proton_html/O/ProtonO18xs.html # p + 18O Total neutron production # Q-value =-2.51902E+00 # # # energies = 45 # E xs...

I'm reading a book and there is a section about rules to do with logarithms but one of them I don't understand, it is very wordy and I just can't get what it means. It says "The logarithm of the power of a number is that power multiplied by the logarithm." I really don't understand what that...

Paired means test vs two-sample means test [solved] Hi. When it comes to hypothesis testing, what is the difference between the two-sample tests and the paired test? I know one difference is that you use the latter when the two variables are dependant and the former when they're...

Hi everyone, I have recently been trying to make a nanoemulsion of an aqueous solution by means of Electrospray. The basic principle is supplying a fluid through a very thin capillary tube and applying an electric field. Usually, when a fluid is supplied through one of these capillary tubes...

What means "harmonic"? The term "harmonic" arise in the math in several subjects, harmonic series, harmonic function, analysis harmonic, mean harmonic... but in each context harmonic have a different interpretation, but exist a general interpretation for "harmonic"? From where is "harmonic" and...

I'll start with what I do know: [SIZE="2"]Shannon Law gives the theoretical upper limit C_{noisy}=B*log_{2}(1+\frac{S}{N}) if S = N, then C = B As N→∞, C→0 As N→0, C→∞ Nyquist Formula says approximately how many levels are needed to achieve this limit C_{noiseless}=2*B*log_{2}M (If you do not...

Homework Statement Hi! In my physics class we've been doing this classical experiment where we measured the induced voltage in a coil when letting a magnet fall through it using a PASCO system. Now I understand perfectly fine most of the theory behind this, and understood how to calculate the...

Distributions: sample mean and variance, and variance of sample means? Hi. Say you have a population, and from there you can draw a stochastic variable ##X## with a specified distribution. So you take out a few sizeable samples from the population, and calculate the mean and variance of ##X##...

I'm a few weeks behind in this news but it seems that an astoundingly simple way of producing pluripotent stem cells has been discovered. The method is being called stimulus-triggered acquisition of pluripotency and involves a transient exposure to low pH...

During exploring the Electrical Transmission and Distribution Network I came across the following terms. "Supply, installation, testing and commissioning of LV 600V/1000V insulation grade Panel Board consisting of following but not limited. I). 2700A single bus bar. II). 2x2700A Off...

Can someone please explain to me what a "dynamical trajectory" means? I am reviewing the first chapter of my classical mechanics book (Fetter & Walecka), and in the very first section he uses the term "dynamical trajectory". I have seen this derivation many times, but I just don't understand...

like autoignition temperature... materails will ignite spontaneous in (low pressure) with concentration oxgen and less heat temperature...

Here is the question: I have posted a link there to this thread so the OP can see my work.

In signal processing , what do the term 'feature' means? Feature extraction etc. For example, in audio signals what are the main features? -Devanand T

Homework Statement Attached Homework Equations Attached The Attempt at a Solution in my equation for Vrms I am confused to as what values I use for "n" and what "n" stands for in the equation. any help would be greatly appreciated! thanks pf

Hi, I have a quick question. When constructing a semiconductor diode, the P-N junction is used to create a depletion region (depleted of mobile majority carriers) which is the active volume of the diode/detector. The region enables an electric current generated from the incomming radiation to...

Hi all, this is 1 of my homework questions. The resolution of microscopes is approximately half the illumination wavelength. a) Assuming a visible microscope has an average wavelength of 550 nm, what is the resolution limit? I'm not sure what my teacher means by resolution limit?

Show by means of example that lim/x→a/[f(x)g(x)] may exist even though neither lim/x→a/f(x) nor lim/x→a/g(x) exists. I have tried using examples such as piecewise functions and rational functions, but can never validate the statement. Any guidance and help would be great. Thanks.

when we say two masses or charges or particles interacts with each other, we have used the word interacts, what does that mean, does that mean a physical contact or something of that kind?

Homework Statement Explain in your own words what: lim f(x) = 5 x→2 means. Homework Equations None The Attempt at a Solution I wrote: "As x approaches 2, the limit of the function f(x) is 5 (in other words, f(x) approaches 5). The value of the function that is...

Hi all, White noise means a noise signal with Power spectral density flat in the working frequency ranges. OK I know why it is named as white too. But what does really whitening means for example in Independent component analysis etc. -Devanand T

These days, "Entry-Level" means 2-5 yrs experience. Anyone else noticed this?

Consider these propositions, P=It is raining, and Q=There are clouds in the sky R=giving a cookie by me, and S=cleaning room by kids What does P-->Q and R-->S mean in words?

I have a one-dimensional set of data which I have attached an image of. This data is an intensity z, as a function of time, t. There are many data points over time with a large amount of scatter. However, if the data is binned over very short wavelengths we see that there is smooth variation...

Say ##V_{out}=4e^{j\frac {\pi}{6}}##, what is this mean? It is a scalar voltage. Does this means: 4e^{j\frac {\pi}{6}}=4\left(\cos \frac {\pi}{6}+j\sin \frac {\pi}{6}\right) = 4(0.866+j0.5) = 3.4641+j2=4\angle 30^o What is the phase shift means, reference to input? Thanks

What it means "the theory violates unitarity" Hello, I know what unitary transformation is, but what does it mean that the theory does or does not violate unitarity? For example in some textbooks on QFT one can read that the Fermi theory of beta decay, which is not renormalizable, also violates...

Hello, I'm currently working on the background for a science fiction collection of short stories I am working on, and communication by means of entanglement plays a big role in it, and I want to make sure that I get it right. So here it comes. As I understand it, particles can become...

is this means that torque is proportional or inversely proportional to the cube of speed the problem says The torque of a load driven by a 385-V, Dc shunt motor varies as the cube of the speed. The current taken by the motor is 51A at a certian speed. Calculate the additional resistance...

In VHDL, what is strongly typed means? ie like VHDL is a strongly typed language etc -Devanand T

I've just started to learn about how to solve statically indeterminate problems and I just want to check my understanding. If I've got a fixed support at x=0 then does that mean \frac{dv}{dx}=0, where x is distance along beam and v is deflection? As in the picture here,

I am learning Fortran and I am able to write code for 3 number means. Now For computing it for set of numbers is not getting in my mind. I am not able to do it. Writing a single Fortran program that calculates the arithmetic mean, rms (root-mean-square) average, geometric mean, and harmonic...