Testing Definition and 634 Threads

Homework Statement For a quantitative variable, you want to test H0; \mu=0, against Ha, mu not equal 0. The 10 observations are 3,7,3,3,0,8,1,12,5,8 a. I get this part b. The P-value is 0.002. Interpret, and make a decision using a significance level of 0.05. Interpret. c. If you had...

\frac{12.34 - 12.33}{12.33} x 100 = 0.054

suppose you have a solenoid with hollow core connected to a galvanometer. On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. S pole is nearer to solenoid). ie. [S - N] [Solenoid] [N - S] Both magnets are...

Homework Statement I have 25 pairs of values. I have a gradient and want to test if this gradient is significantly different from 1. Which stats test do I use? I thought of using a one-sample t-test, but how are you meant to put 25 gradients in the test!? thanks...

Hello, I am making a circuit which runs a large current through a material at intervals, heating it, which then temporarily stops to make a resistance measurement. Each individual circuit is not an issue in itself, nor the timing of it since I have a computer interface which can grab analog...

In testing the loss through a fiberglass panel I experienced instances where the received power level increased. I have checked and double checked my setup and changed the distances between the horn and panel, I still am seeing odd results. Has anyone had any experiences such as this. I am...

I have a few series which I'm having trouble proving whether they converge or diverge. I know the following tests for convergence: comparison test, ratio test, n-th term test, and root test. Here are the series and what I have tried so far: \sum n -1 / n2 : I'm assuming this series diverges...

Homework Statement I am creating a device to provide 250 to 300 g's of impact force to an electrical device in a plastic housing. I would like to lift a steel plate approximately 16" x 16" X thickness "T",, to a height of "Y" and release it. It would fall at the rate of gravity, impacting a...

I want to test if one Poisson distributed result a is large than another one b. I don't know much about statistics, but I understood the Wiki article about testing normal distribution however they need the number of samples there. Basically I measure two Poisson distributed variables, I get two...

looking to design and hopefully build a micro-tensile tester to test the properties of human hair. as part of my uni class I need to design the grippers involved and have a look at non contact extensiometers. Could anyone point me in the right direction with some links or books? or even...

hello everyone, I'm doing a presententation on the physics of crash testing next week. It should be around 10-12 mins, and I need to cover Environmental, Social, Technological and obviously Physics of the topic. Any help, tips, or information would be greatly appreciated? even book names that...

can anyone proove "kelvin plank" statement of second law of thermodynamics or atleast show that it is always followed in any cyclic process...

Hello, I don't know a lot on this subject, but at a last nights weekly philosophical discussion a friend mentioned that they could use MRI machines to scan and see electrical impulses light up parts of the mind during electrical impulse testing to the brain. I guess like showing images to...

Hi all, I have the following code: where checkHR and checkMIN are 8 bit vectors (7 downto 0)... and SECL, SECH, MINL, MINH, HRL, and HRH are all 4 bit vectors (3 downto 0). What I'm trying to do is check to see if the first four bits of checkHR is equal to HRH. Can someone tell me...

I work for a plumbing company, and we recently put up some copper water pipes (~30mm) in a newly constructed building. The buidling isn't finished, and since it's below 0 degrees we can't test the pipes with water. So, we though about doing it with air instead. Some people tell me that this...

I am designing a Roll Cage (Using CAD+FE) and trying out new materials for testing/analysis. Commonly used materials i found are: * CDS Carbon Steel * ERW Mild Steel * DOM Mild Steel * Cr (Chrome Molybdenum) Steel * T-45 * 1020 Grade Mild Steel CDW Anybody...

How can I tell if the popsicle sticks in my physics bridge are under compression or tension. The weight is put on top of the bridge

How do we know that a given operator is Hermitian. I know that for an operator A to be Hermitian then A=A+. But I don't know how to apply this on something which is not in a matrix form. For example I want to know if L_x (x component of angular momentum) is Hermitian and I have no idea how to...

Testing of Impact Sensor--Verify G-Force Readings I'm thinking either free fall test or pendulum but I was just curious if anyone could suggest an easier method We are looking for a way to test a newly developed impact sensor and verify that we when it says it has been hit with 5 g's for...

Homework Statement Measurements o the percentage of enrichment of 12 fuel rods used in a nuclear reactor were reported with a sample mean of 3.26. Test the hypothesis H_0: \mu=2.95 versus H_1: \mu\neq2.95, and draw appropriate conclusions. Use the p-value approach. Homework Equations...

Homework Statement A machine produces metal rods used in an automobile suspension system. A random sample of 12 rods is selected and the diameter is measred.The sample mean is 8.28. and the significance level is 0.05. Is there strong evidence to indicate that mean rod diameter is not 8.20 mm...

Hi, I'm building a STM, and this is the circuit I use : http://www.geocities.com/spm_stm/Simple_STM_Rev_C.PDF I'm right now testing the circuit I build. I build a small part (U3A), and then test it, and build another small part (U3B) and test, then connect the two and test it again...

i have to think of different ways to test ohms law but could only come up with using an ammeter and voltmeter..the typical experiment that is seen all over the internet. what way could i test this law using basic everyday things? and what errors could happen for the typical experiment? could...

How does a rocket get tested in a wind tunnel? what is it's orientation? an airplane is facing the air, like in reality, as it flies. so does that mean you mount a rocket vertically, but have the wind come on the side? or do you mount it pointing in the direction of the wind? and does...

My girlfriend and I were talking, and she said that a way to tell if a vitamin is absorbed or not, is to mix a few different chemicals (can't remember what), and to see how the vitamin dissolves in this mixture. She said that it's because this mixture will have the same acidity as your stomach...

hey does anyone know how you can carry out an experiment to find out if a metal or non-metal has a metallic lustre?:confused: i have tried looking all over the internet but i can't find anything... if u could post answers or terms i can place into the google search panel it would be greatly...

Can anyone point in the direction of any information on dry lift testing for turboshaft fuel pumps? I need to write a good practices guideline for this and need to find as much info as I can. Thanks.

I know there are 3 kinds of symmetry: x-axis, y-axis, and origin. So, if you test the function for symmetry and it turns that it has one of these, does it mean that it cannot have the others? Therefore, one function has one type of symmetry only?

One fine day I was going about my business when I heard that the Maths Tower at Manchester University was to be demolished. I was shocked. To me it was an inspirational icon of learning, the thing that put the campus on the skyline, on the map, and on the picture postcards. I used to sit on the...

Hello, I am working on a project where I will have to do some shear cell testing, I have some basic under standing (very basic). and I have done some research on the internet. I have a shear cell tester. it is very basic, geared motor with a rod to push on sample , which is under a weight. I...

If I were to go to a random hardware store and look at some iron, how would I be able to tell how soft or hard the iron was? Also, is there any other cheap magnetic material that would work better then iron to make an electromagnet with? Thank you for your time.

I want to work on a bandpass filter program, but I'd like some realistic data to try it on. There's got to be something on the web to write/test programs with. Any suggestions?

Hello, Is there people amongst you who have ever dealt with Wind Tunnel testing? I cannot find a special section for experiments in this forum... I have a few topic to launch! Thanks...

How do you know that other people are self-aware and not just very sophisticated computers? In other words, let's say you had a box with something inside that gave answers to your questions, how could you ever tell if the thing in the box was self-aware? If it's impossible then what's the...

How would I compute the type 1 error rate of the following test: accept that coin is fair if in 30 tosses the coin gives between 11 and 19 heads (inclusive), reject otherwise. I guess my Ho is 11/30<p<19/30 and H1: p < 11/30 or p > 19/30 so type I prob = P(p < 11/30) + P(p > 19/30)...

Homework Statement for testing Ho : p = 0.2 vs H1: p > 0.2 when will the power of Rao score test be larger: 1. alpha = 0.05 n = 10 2. alpha = 0.01 n = 10 Homework Equations Rao score test: reject Ho when |sqrt(n)*(p' - po)/sqrt(po (1-po)| > z(alpha) po in this case = 0.2 and p' is...

Homework Statement I have two variables (both nominal) union membership 1/0 and race 1/0 and I have to find if there is a relationship between them. The task is formulated like so: "Is there a relationship between union membership and race (black versus non-black)?" I know I have to state...

I'm currently testing a program I made for my professor. It's just a simple test, but it will probably take like 15-20 minutes! So, I'm killing time. The nice thing about our small department is that I can take off and leave my laptop behind without worries. I'm going to do a more...

Homework Statement Does the sum of the series from n=1 to infinity of 1+sin(n)/10^n converge or diverge. Homework Equations The Attempt at a Solution I can use the comparison test or the limit comparison test. I'm not sure where to go from here.

A few weeks ago Physical Review published a Letter (an edited version of http://arxiv.org/abs/gr-qc/0702028" ) that says: "At this time, [Lunar Laser Rangefinding] provides the most precise test of [the gravitomagnetic phenomenon,..] likely better than the ultimate result from the GP-B...

I'm pretty embarassed that with a math degree I don't know how to do this. But today someone asked me to help him test this series for convergence: \Sigma \, ln(\dfrac{(k+1)^{2}}{k(k+2)} ) Maybe I'm just having a brain fart, but I can't think of any series to compare this to, and I...

Has anyone heard of this proposed test of string theory's extra dimensions? What do you think? Within the realm of reason? Doable within the next decade? Robert === http://www.news.wisc.edu/13422.html ...physicists at the University of Wisconsin-Madison have devised an approach...

Does anyone here know of a good circuit testing program that is free that includes diodes? I need to find certain voltages on specific points on a circuit, and I can't find anything good out there that can help.

Find the Limits1. lim 312 x->11+ 2. lim (x^2 +9)/(x^2 -1) x->1for #2 i got 10 as the answer, but I'm not sure if its right. Thanks edit: Sorry, wrong forum

I really don't understand hypothesis testing. How do I recognize which one is Ho and Ha in a problem? Is there a particular trick to facilitate my lfie?

Are there any experiments which test special relativity? I know of the Kennedy–Thorndike experiment, but it involves light. I am curious whether a different kind of experiments showing relativistic effects like time dilation or length contraction have been performed (I'm thinking of experiments...

For the function ## y=f(x) ## is there a test to prove if its roots are real or either has some complex roots?, or in more general cases: ## y=g(x)D^{k}f(x) ## k>0 and a real D=d/dx number.:rolleyes: :rolleyes: The question is that sometimes it can be very deceiving to tell if a function...

Need to know the test that will be performed on the following question: The data comprises hours devoted to patient care per week for practitioners in conventional and alternative medical practices. Question: Can we infer that the mean amount of time devoted to patient care per week by...

Hi, I am doing a small project on the "construction and control of a modern tensile testing machine" and am a bit unsure as to where to start on this! Does anyone have any ideas as to where I could find information on this subject, or know anything that might be helpful? Thanks, Chris

Dear all: I am a student at the University of Hartford and next semester I must take an Introductory physics course with basis on Calculus. Now I was pondering simply takeing a month or two and teaching it to myself and then testing out of the class so I can move onto more advanced...