Recent content by hahaha158

Homework Statement Some car tires can develop what is known as "heel and toe" wear if not rotated after a certain mileage. To assess this issue, a consumer group investigated the tire wear on two brands of tire, A and B, say. Fifteen cars were fitted with new brand A tires and thirteen with...

thank you! your explanations helped a lot

Sorry, my last reply was worded poorly. I meant to choose an arbitrary value for φ^k+1 - φ^k, i didn't mean to imply that the value is equal to σ. In any case, it doesn't seem like you actually need to calculate σ, since in the algorithm it is initialized as 0, and they have a line that...

ok, so since σ is not used for testing convergence like I assumed, can I choose an arbitrary value of let's say 0.001, and then in the section under algorithm that says test for convergence, can I just check to see whether φ^k+1 - φ^k < 0.001, and exit the loop if so?

Under the algorithm section, i guess they use for the x and σ for the change from x^k to x^(k+1)? Are these assumptions correct? If so, is finding σ just x^(k+1) - x^k, and I want to keep iterating until σ < (arbitrary minimum i choose?)

I have D = [[1,0,0][0,1,0][0,0,2]], L = [[0,0,0],[5,0,0][3,1,0]] U = [[0,2,3][0,0,-3][0,0,0]]. From here do I plug into the x^(k+1) equation? How do I find x^(k). What is the xi^(k+1) equation?

Hi I am working on a programming assignment that requires me to implement the successive over-relaxation algorithm. We are given the wikipedia page for this: http://en.wikipedia.org/wiki/Successive_over-relaxation. I have read through the wikipedia page for this numerous times but am still...

Homework Statement In a study to estimate the proportion of residents in a city that support the construction of a new bypass road in the vicinity, a random sample of 2025 residents were polled. Let X denote the number in the sample who supported the proposal. To estimate the true proportion in...

Homework Statement The wait time (after a scheduled arrival time) in minutes for a train to arrive is Uniformly distributed over the interval [0,12]. You observe the wait time for the next 95 trains to arrive. Assume wait times are independent. Part a) What is the approximate probability (to 2...

got it, thanks!

I realize that lamda is just 1/mean but I am unsure what to use for t, can I just use t = 5? This seems like the probability that the first success is WITHIN the first 5 tries rather than on the 5th try like required

What formula am I meant to use? I only see F(x) = 1 - e^(lamda*t) but that doesn't look like the appropriate formula for this question

Homework Statement The life times, Y in years of a certain brand of low-grade lightbulbs follow an exponential distribution with a mean of 0.6 years. A tester makes random observations of the life times of this particular brand of lightbulbs and records them one by one as either a success if...

Homework Statement solve 4y''-4y'+y=16et/2 Homework Equations v1= -∫ y2g/w v2= ∫ y1g/w The Attempt at a Solution http://imgur.com/gxXlfdH the correct answer is 2t^2 e^(t/2) instead of what i have though, i am not sure what i am doing wrong?

Homework Statement Homework Equations J=I/A The Attempt at a Solution I was just looking at the solution for this, and I was confused because they seemed to use different ways of finding the area. For finding J2, they took the surface area of the end of the cable, pi(r3^2-r2^2), but for...