Testing Definition and 636 Threads

In my work we are suffering now from a problem of magnesium in water that we are using for drilling, we need test kit to test magnesium oncentration we could not use photometric analysis or any other complicated device we need method of testing depend on titration reaction could anyone help me

Homework Statement A random sample of 30 rats has 18 females and 12 males. If last year's proportion of females treated was 0.65, do the above data confirm that this year the proportion of females is different than last year? Homework Equations p = treated / total If using standard...

Psychometric Testing: Does it work/are the results reliable/accurate? What do you think of it?

Homework Statement determine if the space is a subspace testing both closure axioms. in R^2 the set of vectors (a,b) where ab=0 Homework Equations The Attempt at a Solution i just used the sum and product which are the closure axioms. But at the end how do you tell if the...

I need to test photoheteretrophic, autotrophic and fermentation growth of R.rubrum bacteria, all of which require anaerobic conditions. For fermentation, i am placing the bacteria with fructose in the dark, and for phototrophic in the light with fructose, and for autotrophic in the light with...

Hi, I have a large data set with with less than 10% missing values (missing response, but all predictor variables present). It is a near certainty that these values are not missing at random, dependent upon the missing value. The response is survival time of a land parcel with 'death' being...

Ok, so here's my scenario/question. I am a technician that works on generators and does load bank testing on them. I'm having a debate with my boss about power factor and IF I'm wrong--I would like to understand why. Today I load banked a generator that was rated at 25kVA and could run...

I took a year off after high school and I have decided to go to college this fall. So... I need some self study material for everything before calculus. I have found a few pdf's online and this site has been a great help as well. I found some recommendations for books in the archives here...

EDIT: The latex doesn't seem to be working at all... not exactly sure why this is. I can't delete the post, so, uh... never mind, I guess? EDIT v. 2.0: Yeah, so copying and pasting images from LatexIt is apparently beyond me... Thanks for the help, razored! Right, so, any help anyone can give...

If \sigma = 10 km/h and \mu = 74 km/t, find the probability that we when measuring the speed of 12 random cars can conclude that the expected speed of the cars is less than 77 km/h. Use \alpha=0.05 level of significance. z = \frac{\bar{x}-\mu_0}{\sigma / \sqrt{n}} =...

Hey everyone, I'm working on my undergraduate thesis in biology and am having problems analyzing the data from my experiments. I'm wondering if anyone knows how to compare multiple independent groups when the measurements are proportions. The problem is that many of my values are 1 and 0 with...

Homework Statement 1a) The strength of concrete depends to some extent on the method used for drying it. Two different drying methods were tested independently on specimens. The strength using each of the methods follow a normal distribution with mean μ_x and μ_y respectively and the same...

Homework Statement http://www.geocities.com/asdfasdf23135/stat14.JPG Homework Equations Statistics: power function The Attempt at a Solution a) Test statistic: Z = (X bar - 13) / (4/sqrt n) Let μ = μ_a > 13 be a particular value in H_a Power(μ_a) = 1- beta(μ_a) = P(reject Ho |...

i am looking to build my own testing apparatus to do some crude thermal conductivity test experiments on various motor oils. 1. anyone have any links to such methods or apparatus? 2. how does one take into account fluid convection while trying to determine the TC of a fluid? my initial...

In his famous (but unknown to me until recently) 1967 paper,* Richardson showed that the problem of deciding whether a one-variable subelementary expression (an expression involving +, -, *, exp, sin, composition, the constants log 2, pi, and all rational numbers, plus variables x_i) is negative...

What could you do to obtain a more precise measure of the elastic modulus of a material in tensile testing?

What is the difference between NOT being able to reject the hypothesis that a particular parameter is zero and being able to conclude that it is within some acceptable distance from zero ("practical equivalence")? I guess this is more of a logic question, but I'm still having trouble...

Homework Statement My goal is to have enough info that I could sit down with a piece of paper and actually compute a pretend test from start to end. All the examples and docs I have found online are not nearly in layman's terms.. oh, please excuse my math-lameness btw. :-) If I have 5-7...

Hi, as I've stated before I am doing research in the area of jet fuel contamination. However I have shifted my focus to methods of testing. I know many of you work in the aerospace industry. What I need to know if there are any "popular" or "standard" methods you use at your company or perhaps...

ok the device used is called a “Instron” electromechanical testing machine. not sure if anyone is familiar with this, but that isn't the real point. ok, so an aluminum beam, dimensions: "ext. gauge length: 4in" "Spec. gauge length: 2in" "thickness: 0.037in" "width: 0.5in" now, the...

Homework Statement On a recent homework problem, I tested a series for convergence using the comparison test. If the first term of the series to be tested, a_n, was included, my test was inconclusive. From a problem that the lecturer did in class, he stated that the first few terms of an...

I am designing a machine using a cam to generate a down force on a customers product (chew toy). The customer is wanting to try out different materials against his current production model. I was wondering if anyone could help me calculate the cam force in the veticle direction using a 110...

I am checking to see if my thought process is correct for the problem below along with my work. http://i674.photobucket.com/albums/vv106/jason03_2009/probb.jpg http://i674.photobucket.com/albums/vv106/jason03_2009/page111.jpg...

Lead in the form of -for example- Tetra ethyl lead has long been used as fuel additive, ultimately causing soil pollution. There is concern that this lead ultimately settled in wood during the growing process, which may have led to unacceptable concentrations of lead in wood. So, it would be...

What are standards used for in TLC. Are they used so as to compare some unknown substances, and then from that to determine what chemicals/molecules have been separated or are being used?

First off, apologies if this is in the wrong section. It might be more of an engineering problem but I couldn't really work out exactly which section it should go in. My young sister is doing an engineering course and has become stuck on a particular question, I offered to help not expecting it...

Homework Statement I have used OLS and found that: b0 = 6,85 b1 = 3,88 with se= 0,1121 n = 20 Person x claims that b1 = 5 Choose an alternative hypothesis. Does your estimated relationship support this claim? Use a 5 % significance level The Attempt at a Solution H0 = b1 =...

Hi. I am designing an experiment focused on radio waves for my experiment and this is the basis of it: Three antenna's will be tested for point to point transmission (VHF): [ 144 MHz ] >>3/4 Wave antenna >>1/4 Wave antenna >>5/8 Antenna (Best Angle of Radiation Usually) These...

Help! I've got this device that I feel responsible for getting working and I want to test its circuits. It is currently dead. It's this http://www.canadiantire.ca/browse/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524443293144&FOLDER%3C%3Efolder_id=1408474396672427&bmUID=1230269280757". The...

Preparing a 0g test for “space drive” that apparently conflicts with law conservation Plans of testing a working model in a 0g environment are being considered for the first semester of 2009 (Zero Gravity Flights) we hope to demonstrate we have a practical working idea. I would be grateful if...

I am on an assignment to test the domain of input values of a tachometer, and what output (deflection) different values correspond to. In other words, what's the minimum and maximum signals and what does the curve look like? The trouble is I can't get ANY useful information. The tach has...

Homework Statement Due to the expense involved, car crash tests often use small samples. When 5 BMW cars are crashed under standard conditions, the repair costs (in dollars) are as shown in accompanying list. Use 0.05 significance level to test the claim that the mean for all BMW cars is...

Hi I am reading a popular physics book. It discusses the test of Einsteins theory by Eddington at the eclipse. "The deviation of the light was double that predicted by Newton's physics" Why does classical physics predict any deviation of light by gravity, did light have a mass in...

For those of you not familiar with the mandelbrot set, it is the set of all complex numbers c for which the following transform remains finite for an infinite number of iterations: z --> z^2 + c z is 0 for the first iteration My question is this: How can I conclusively determine...

http://physicsed.buffalostate.edu/courses/software/modeling/1st_mechanics/PDF%20files/4-FP-Inertia/Tests/Quiz%201.pdf 1) I don't know how to do this, but I know there is the force of gravity by the Earth in the force diagram.. 2) For this one I got the answer Fx=7.5N [I did 1/2(15N) which...

arXiv:0811.1229 (cross-list from gr-qc) [ps, pdf, other] Title: Unambiguous Quantum Gravity Phenomenology Respecting Lorentz Symmetry Authors: Yuri Bonder, Daniel Sudarsky Comments: Based on a talk given at the 40th SMP: Geometry and Quanta Subjects: General Relativity and Quantum...

how can i can the convergence of sum[sin (0.4)n / n pi]2 and that sum[sin (0.4)n / n pi] diverges, n is between -infinity and + infinity

I am developing a new product. I am currently constructing various prototypes of the product changing only one component using a different material with each model. I want to test the impact results of each different model dropping a consistent weight (i.e. 20lbs) from a consistent height...

Bojowald (and other bounce QC researchers) are approaching a kind of 'moment of truth' with the April 2009 scheduled launch of Planck and Herschel satellites. The nonsingular Quantum Cosmology models they are developing are expected to make predictions about structure formation in the early...

if i keep a funnel shaped long tube on the roof of a moving vehicle, will the air going in follow Bernoulli's equation?

Hi guys. Im new at this site so please be nice to me =P. I've been working on some practice papers for my upcoming end of semester exams. Cant get these two questions out ><. Any help is greatly appreciated Thanks in advance jenny xoxo 1. A sample of 28 students measured their...

Hi. I'm not too good at maths and I'm having some trouble figuring out the basics of what to do with complex conjugates of functions. Our lecturer has set a couple problems requiring us to test if a few operators are Hermitian. Before I can get to those I thought I'd test the basic momentum...

Homework Statement Having trouble understanding the question, which is... voltage specified to be 130 Sample of 20 readings gives sample mean of 128.25 Also given s.d.=3. "It is important that the voltage not be allowed to drop below 128 volts. What is the probability of rejecting mean...

I'm not sure if this is the right place to ask, but would any of you have recommendations as to where I can get this online first or preferably second hand at its best price? Alternatively, do any of you have this book and you wouldn't mind selling? My country is plenty small and my whole...

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Homework Statement Is the series from n=1 to infinity of 3/n converging or diverging? Homework EquationsThe Attempt at a Solution Since 3/n is not a geometric series, my guess is that we can just use the Test for Divergence and take it's limit to see if it's converging or diverging. As...

So I implemented a tridiagonalization algorithm, however I don't know if the result that I am receiving is accurate. Does anyone know of an easy way of testing this? I suppose it is possible to scour around for code, but it would be difficult to find matching code. So if anyone knows anything...

I am going to test a full body harness. I need to know how far a 420 pound weight needs to drop to exert the same force as a 350 pound weight dropped 5 feet. Thank You Norm Wood

Hello, I was wondering what kind of reliability tests I could do with landing gears. The one we are working with, is a conventional, trail dragger. Right now, we are building a model and later on the full size. But we are focusing on reliability and I'd like to know good methods so that I...

Hi guys For a science fair project, I am going to test the effects of X-radiation on flash memory. I'm intending to fill a number of 16MB (15,876,096 byte) Compactflash cards with data, hash check the data with hkSFV, expose them to the radiation and hash check again for any data corruption...