A test or examination (informally, exam or evaluation) is an educational assessment intended to measure a test-taker's knowledge, skill, aptitude, physical fitness, or classification in many other topics (e.g., beliefs). A test may be administered verbally, on paper, on a computer, or in a predetermined area that requires a test taker to demonstrate or perform a set of skills.
Tests vary in style, rigor and requirements. There is no general consensus or invariable standard for test formats and difficulty. Often, the format and difficulty of the test is dependent upon the educational philosophy of the instructor, subject matter, class size, policy of the educational institution, and requirements of accreditation or governing bodies.
A test may be administered formally or informally. An example of an informal test is a reading test administered by a parent to a child. A formal test might be a final examination administered by a teacher in a classroom or an IQ test administered by a psychologist in a clinic. Formal testing often results in a grade or a test score. A test score may be interpreted with regards to a norm or criterion, or occasionally both. The norm may be established independently, or by statistical analysis of a large number of participants.
A test may be developed and administered by an instructor, a clinician, a governing body, or a test provider. In some instances, the developer of the test may not be directly responsible for its administration. For example, Educational Testing Service (ETS), a nonprofit educational testing and assessment organization, develops standardized tests such as the SAT but may not directly be involved in the administration or proctoring of these tests.
Homework Statement
We sample a population 50 times with replacement, with all individual sampled equally likely. We survey the gender and quality of life. The counts are: Male: 13 high quality, 11 low | female: 18 high, 8 low.
Let P_M, P_F, P_H, P_L to denote these population proportions for...
This is the question:
Suppose that X1...Xn form a random sample from the Bernoulli Distribution with unknown parameter P. Let Po and P1 be specified values such that 0<P1<Po<1, and suppose that is desired to test the following simple hypotheses: Ho: P=Po, H1: P=P1.
A. Show that a test...
Homework Statement
I have a few questions i have to solve. They are quite similar.
1. Given the following, draw conclusions about the 10% and 5% levels of significance. Then find a p-value.
n = 10,
mean: 8.179,
std. dev: 0.02,
|mean - μ| = 0.021,
z_{0.05} = 1.645,
z_{0.025} = 1.96...
Hi, i have been doing a science project about radiation of smartphone functions. I have tried to use a EM wave receiver to measure the frequency of RF but it didn't work.How can i measure it (in hertz)?
Homework Statement
The Electric field lines in an X-Y plane are given in the attached image. The field is defined as E=αi(vector)y at x=0 and x=some distance along the positive X axis. α is a positive constant.
Test for charges in the X-Y plane
Homework Equations
N/A
The Attempt...
Hi,
I'm a bit uncertain about the validity of my argument/approach to the following:
I'm trying to prove that the solution to a partial differential equation
\frac{\partial u(x,t)}{\partial t} + N[u(x,t)] = 0, where N is some nonlinear operator, CAN BE (not necessarily is) asymmetric...
How can you test an area for radium cheaply, and how can you test your body for exposure. In other words how would you test a room? And what types of tests could you get yourself?
Homework Statement
This is not a homework problem, rather it is a conceptual question.
I am wondering if the below is an accurate illustration to explain why I reject the null hypothesis.
Such that
H_{0}: \mu=\mu_{0}
H_{a}: \mu\ne\mu_{0}
By relating the reasoning with the diagram...
Homework Statement
Without a graph, test the suggestion that the speed, c, of the water wave is related to water depth, d, by:
c ∝ d^1/2
No other data is given, this is suppose to be collected by myself but I am revising for a practical exam paper without having the data given. Markscheme...
Statistics doesn't come to me as naturally as math.
I'm curious as to how to make a hypothesis test under the assumptions that the population standard deviation is unknown and using tables only.
Here is my understanding.
Given
Suppose:
H_0: \mu = \mu_0.
Suppose also that:
\bar{x}, s is the...
Hello all.
Was wondering when I test for amps on my car's battery when sitting in my driveway why doesn't the car's electronics work when I hook up the battery via a serialized multimeter? The current should still, theoretically, go through the meter to the car's electrical system but it...
Hi,
So I came across this article on the internet, and it was about the Equivalence Principle. So I were interested and read it all, and in the article it said that the EP might be only approximately true. What interested me more about the article was it said that any theory of quantum...
Hello hello, I'm not looking just for an answer per say, but am also wondering the thought process in solving problems such as the following:
Hopefully this doesn't take up too much of someones time.
Determine whether the following equations are logically equivalent:
1) (∃x)( P(x) →...
Greetings,
I have two signals, I need a way of testing whether they go above certain threshold voltages for a period of 0.5 seconds. This must be non programmable. I am a bit stumped o how to do it.
I thought of having these signals go into an AND gate and then have that AND gate feed into...
Say I have a "large" population (larger than 1000) of red cards and blue cards which I want to find if it is evenly split (1:1 red:blue ratio).
So I do an experiment and pull out 125 cards at random, and find that I have 50 red and 75 blue. Based on this experiment, what can I say about the...
Hi everyone.
What is the metal thing on the top of the testing transformer (figure below)? It looks like electrode, but what is the use? I find it ubiquitous in many HV equipments.
Sir,
I'm an undergraduate in 'Electronics'.Intending to develop a solar simulator with LED as the light source.
It is understood that the spectral irradiance of sun can not be generated with the LED.So my plan is to light up a number of high power LED arrays of different...
The significance level of a test is the probability that the null hypothesis is rejected when it is true, right? And the critical region is the region that we reject the null hypothesis...so can the significance level be calculated by finding the probability of being in the critical region...
In this link:
http://www.math.harvard.edu/~phorn/362/362assn3-solns.pdf
Why isn't the significane level for number 5 just 0.01? Because we know that if the mean is 30,000 (the same as the mean for the null hypothesis), the value of the power function is 0.01...
Thanks in advance
Hey,
I am brand new to this Forum, and I am trying to design a pressure testing chamber. The plan is to test a sample cylinder that is fitted with two needle valves and a quick connect fitting for leaks. I want to do this by pressuring it up to 1800 psi with air and putting it in the chamber...
I think I’m a bit confused about what \alpha is. For the definition that is given, what theta really means when they say [tex]\alpha = max_{\theta \in w_0} P_{\theta} [(X_1, … , X_n) \in C]. I just think that it’s not really clear in my head, so is it ok if anybody explains/gives and example...
Homework Statement
Alright, so I am a graduating senior studying Exercise science and physiology. I just had what we call "Client Testing" and ran my client (who was a collegiate athlete for the last four years and this year was her first year not competing or training) in the Bruce protocol...
Hey guys. As the title reads, I am a part of a research project and we will soon be testing a 100lbf jet engine. We take safety very seriously and want to take all the proper precautions in order to ensure everybody involved will come out of the experimentafely in case something goes wrong...
I'm trying to find a reasonably fast method for testing whether or not a point (x,y euclidean coordinate system) lies inside a (preferably convex, concave or complex - though different methods for each would be OK) compound polygon with edges consisting of line segments, arcs and/or elliptical...
"Cheap" Hydrostatic Testing Chamber
As background information, I'm a computer programmer by trade but I want to get into underwater ROVs as a hobby because I need a hobby that doesn't involve sitting in a chair all the time, because Bob Ballard was one of my heros as a child, and because there...
Hi, I have a (hopefully) quick question about testing out of certain classes in college via proficiency exams. I am currently halfway through my first semester of freshman year and my current math courses are differential geometry and LA. I took a proficiency exam to skip calc 3 and got the...
Hi guys, litterely just signed up today and am liking the site.
Ill cut to the chase.
I am designing a concrete barrier to resist explosions, ballistics and heavy impact. Now while I am still an apprentice at structural engineering, My knowledge in mechanics and general physics isn't...
This is very interesting, is it the first proposed method (that is within reasonable energy for particle accelerators) to test space at the plank level?
http://arxiv.org/abs/1207.7297
Testing Planck-Scale Gravity with Accelerators
Vahagn Gharibyan
Abstract: Quantum or torsion gravity...
Hey, I am currently doing a project where I have to calculate/(predict) the cv values of a number of valves. at the moment I am calculating Reduced Bore ball valves where water will be going through them. I am now at the stage where I need to test the valves using some sort of flow loop system...
Homework Statement
\sum(\frac{2n}{2n+1})n2
(The sum being from n=1 to ∞).
Homework Equations
The Attempt at a Solution
Used exponent properties to get (\frac{2n}{2n+1})2n. Using the root test, the nth root of an = lim n->∞(\frac{2n}{2n+1})2 = 1. However, the root test is...
Hello,
I am new to the physical therapy field and I have a huge interesting in performance testing, especially VO2 testing. I am currently working on a project involving such testing. I was wondering if anyone knows the effects of unloading during VO2 max testing. For example, if a user...
Homework Statement
Test the following integral for convergence:
\int^{∞}_{-∞}\frac{dx}{\sqrt{x^{4}+1}}
Homework Equations
The Attempt at a Solution
I was able to use the ratio test to show that the integral converges if and only if \int^{∞}_{-∞}\frac{dx}{x^{2}} converges, but I haven't...
Guys I am stuck with this can anyone help me??/
Suppose that 2% of all Olympic athletes use steroids or other performance-enhancing drugs. Because drug
use is a serious violation of Olympic rules, the International Olympic Committee has implemented random
drug tests. Let us assume that the...
Homework Statement
A diffraction grating with 500 lines per mm is held directly in front of the lens of a digital camera, with a bright white light source 8m away. The image recorded by the camera shows both the light source and the spectrum created by the light source. We know that the CMOS...
I'm at the point in my graduate career where I must select an advisor within the coming months. I have about 4 professors narrowed down based on research interests and experience. One professor I get along with very well, but believe our academic interests are not exactly aligned. Another has...
Can anyone explain me how the load is applied to a metal specimen during tensile test?
I am confused because I read in my textbook that after the ultimate stress is achieved and if the load is continued, then the metal specimen fails. But from the stress-strain diagram, we can see that the...
Hi all,
Preface:
So I have run several series of dynamic torque tests on different size 1/4 turn Butterfly valves. In the test, I am measuring upstream pressure, downstream pressure, valve angle (90° is open, 0 is closed), and torque on a transducer. I know the flow rate, which is in GPM...
I have survival and other data for between ~1000 patients from different studies with indications varying from organ transplantation to cancer. Patients within this cohort will have been drawn from many different studies in which the objective - long-term graft survival, overall survival rate...
I need to test a coax cable assy for loss, resistance (AC&DC?) capacitance and inductance? Using a VNA in smith chart mode, how is it done? Do I sweep the coax (S11) with the other end open, shorted and then terminated? I know sweeping S21 will give me the loss @ freq of interest. Its the...
So l have got 16 data points and l would like to know if this data follows a uniform distribution. I have tried using the punif function in R, but l am not sure about the results l am getting. Can someone please tell me what is the best way and hopefully easiest way to see if data is uniformly...
ASTM provides standards for testing that's obvious enough if talk about the standard specimen profile; but idk that some specimen ,for instance round bars, are recommended to have a standard Dog Bone specimen but in case of deformed bar we don't have any special specimen.
Tensile tests are...
Hello,
Here's my question:
When load testing a lifting lug that is welded to the ceiling, placing it under 5 tonnes of pull, using a chain block to tension and a web sling that is attached to the floor directly below, are you:
A) Pulling 5 tonne down from the lug and 5 tonne up from the...
Introduction
For me it all starts with what I agree is counter intuitive:
The Speed of Light
The speed of light. An innocuous phrase. Stating a seemingly obvious fact that light moves at a particular speed, in the same way that anything that moves has a speed.
Yet what does it...
Hey everyone.
I've been working on a axial flux permanent magnet DC generator to use on a 100W wind turbine(small I know), to charge 12v batteries in low wind speed areas. Now that it's complete, I'd like to determine the full power curve at different rpms.
So far I've been running it on NO...
Hey everyone.
I've been working on a axial flux permanent magnet DC generator to use on a 100W wind turbine(small I know), to charge 12v batteries in low wind speed areas. Now that it's complete, I'd like to determine the full power curve at different rpms.
So far I've been running it on NO...
Homework Statement
Hi, this is a stats question, hope I'm asking it in the right place.
I am estimating an animal populations health based on it's weight to length ratio, I have a population ratio (10grams/cm) from 5 years ago and a sample estimate made from recently gathered data.
I am...
We have jack in our lab that is suppose to be connected to ground, but the building is old, and we are not sure if we can trust that it is actually connected to ground. Is there a way to test the ground? If so, what is that way?
Dr. Erzaask