Testing Definition and 589 Threads

What are good ways to prepare for standardized tests (IQ, SAT, etc) that ensure maximum clarity/fluidity of thought?

So, I have a HiPot tester with a minimum capable voltage of 100VDC. I'm testing for any leakage between a string-pot and the housing case for the unit it goes into, with the requirement being 45VDC applied to it. With the HiPot tester incapable of supplying a voltage that low, I am thinking...

Homework Statement Karen asks John to guess the date of her birth, not including the year (i.e. the day and month she was born; discount leap years). If John guessed correctly on his first try, would you believe his claim that he made a lucky guess or would you be suspicious that he already...

Hi, I'm interested in this question primarily in how it relates to what is usually called classic or frequentist statistics (p-values, etc). I'm fully aware of how stepwise and other automated techniques can negatively impact analyses and render inference based upon parameter estimates...

Homework Statement A hire-car firm is considering a special bumper bar designed to lower the cost of car repairs following minor accidents. This bumper bar is more expensive than the conventional one. It will only be introduced permanently if any reduction in the cost of repairs is judged to...

I usually get pretty nervous before tests / quizzes and I am a rather slow test taker. I suppose I could be optimistic and just say I am very thorough. I usually use as much time is allowed, and if there is no time limit I am usually one of the last to leave. If possible I like to go through...

Does anybody know where can I find something about testing machines? Something about main types, how do they operate etc.

Homework Statement Testing golf ball aerodynamics.? how? i need a simple way to test the aerodynamic properties of spheres with different surfaces. i was thinking of doing it with liquid as in this video is there any other way i can do it or perhaps a way i can do it the way they...

Whats the easiest way to test the max output of electricity induced in an air coil. I will wire it 3 phase delta. (or double delta) Will I need a resistive load attached for current flow? What should I use? How do I test? Use a multi tester? Is there math I can use to estimate the amount. I...

I am currently preparing for a few wind tunnel tests on a NACA 2412 airfoil. The lab technician told me that before I can use the tunnel, I need to provide solid proof that the models will be able to hold up in the wind tunnel (up to speeds of 110 mph (30 psf)). In the technician's own words...

Does anyone know if a Na2CO3 solution will change in pH when you leave it for a month? Will the pH go up or down? I thought maybe the CO2 would escape which would make the pH go higher?

Group properties: 1. \forall a, b, c \in G, (a * b) * c = a * (b * c). (associativity) 2. \exists e \in G such that \forall x \in G, e * x = x * e = x. (identity) 3. \forall a \in G, \exists a' \in G such that, a * a' = a' * a = e (inverse) Instruction: Determine whether the...

Methods of laboratory fatigue testing?? I have had a try at this question but don't think the answer was enough. Can someone please check it and give me the correct answer. Question Outline the methods of laboratory fatigue testing and the results likely to be obtained. (10 marks)...

I am designing an antenna for a consumer product. The consumer will be very close to the device. I have designed antennas for products like this many times before and have the proper equipment to do so. It's low power, meets all FCC regs for our band etc... I am tired of doing the...

I'm trying to solve a problem from a practice test I was given. It says. Determine if the sequence is bounded and if it's decreasing or increasing: a = \frac{arcsin(1/n)}{arctan(1/n)} I don't really know where to start as I don't remember seeing how to test sequences for boundaries or anything...

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...

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 |...

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