proportion

  1. S

    Statistics: Sampling Distribution Problem with Dice

    Roll a dice five times. Record the results in Sample 1. Repeat the experiment for Sample 2, 3, and 4. In a live classroom setting, actual survey data is used. In this knowledge check online environment, please use the following data: Sample 1: 2,2,3,4,5 Sample 2: 4,1,5,5,6 Sample 3: 1,5,5,3,4...
  2. A

    Test on a single proportion using hypothesis testing

    Do we use z or t distribution? My book only has the formula equaling to z. Some answers that I've seen on forums use t distribution and some uses z distribution. I was confused so I solved a problem using a z distribution and a t distribution separately. Below are my results. I ended up failing...
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    Kindly help with this sampling distribution of proportion problem.

    Kindly help solve number one. I'll use that as an example to solve the second question. Thanks in advance. 1. Find the probability that of the next 200 children born, (a) less than 40% will be boys, (b) between 43% and 57% will be girls, and (c) more than 54% will be boys. Assume equal...
  4. D

    Proportion problem

    Found this. A manufacturer of cans is to use 1% tin and 99% steel to produce some cans. In stock are 200 lbs. of tin and 40,000 lbs. of steel. He purchases a quantity of used cans that yield 2% tin and 98% steel. Determine amount (in lbs.) of the used cans purchased in order for the...
  5. A

    Computing the sample proportion

    I did what It says to compute the sample proportion. Divide the number of success (543) by the sample size (1025). Why is it still wrong?
  6. E

    Proportion Question 4

    A line segment of length 120 inches is divided into three parts whose lengths are proportional to 3,4,5. Find the lengths of the parts. The answer to this is 30 inches, 40 inches, 50 inches, which I suppose is obvious to some. However, is there a specific procedure I should be using for such a...
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    Proportion Question 3

    Two numbers have ratio 3:4. If 4 is added to each, the ratio is 4:5. Find the numbers. The answer is 12 and 16. I am not sure what steps I take to achieve this.
  8. E

    Another Proportion Question

    The question is: If (x+y):(x-y)=5:2, find x:y This has me a bit stumped. The answer is 7/3. I tried doing the following: \dfrac{x+y}{x-y}=\dfrac{5}{2} 2(x+y)=5(x-y) 2x+2y=5x-5y 7y=3x So I feel I am close, but missing a step.
  9. E

    Proportion Question

    So I am to determine the value of x of the following: (x-1) : (x+1)=(2x-4) : (x+4) So I did the following: \frac{x-1}{x+1}=\frac{2x-4}{x+4} (x-1)(x+4)=(2x-4)(x+1) x^2+3x-4=2x^2-2x-4 5x-4=x^2-4 x^2=5x This is where I get confused. Do I just divide by x and thus get x=5 or do x^2-5x=0...
  10. T

    Difference of proportion hypothesis test

    If I am given two samples of the rate of production of 2 factory conveyor belts, and I am asked to perform a hypothesis test on whether one produces more per hour by 5%. How do I calculate the percentage difference. Is it as simple as setting the null and alternative hypothesis to be equal to...
  11. D

    finding the probability that tge sample proportion is within 0.05 of the population

    Person A claims that the porportion of household installed with solar heater is 0.15. A random sample of 250 household iataken. Assuming the claim of person A is true, finding the probability that tge sample proportion is within 0.05 of the population proportion. the ans given is P ( |pˆ-p| )...
  12. D

    proportion problems (sampling)

    hi , all my ans for n is greater than 995.3 which is missing on the last line of the photo,,, the missing text for the lower part of the question are find the number of people who must be interviewed in the survey.
  13. H

    Proportion

    Consumers turned to their mobile devices in growing numbers and increasing frequency throughout a given year. Text messaging led as the top mobile activity, with 61% of American mobile subscribers texting that year. A polling firm contacts an SRS of 1250 people chosen from the population of...
  14. H

    Proportion

    All euros have a national image on the "heads" side and a common design on the "tails" side. Spinning a coin, unlike tossing it, may not give heads and tails with equal probabilities. Polish students spun the Belgian euro 280 times, with its portly king, Albert, displayed on the heads side. The...
  15. M

    Proportion

    I found the solution https://onedrive.live.com/?cid=48F411219265CF17&id=48F411219265CF17%21105 Proportion- get the procedure correct n-polygon ...
  16. M

    How can get proportions in cricle

    Hi all how can i get a proportion in circles & ellipse. Eg: i have a circle diameter is X, outside the another circle radius is x2, another elipse have maximum perimeter is x4 & minimum perimeter is x5. How can get the proportion of the circle & ellipse, when i say to anybody something like...
  17. K

    Probability sample proportion

    Hi! I've been wrestling with this the whole day, statistics is really not my forte. My problem is this: In a population of 4 260, 30.19 % are positive to a certain product. If I take a sample of 100, what is the probability that the proportion of people, in the sample taken, being positive...
  18. S

    Ratio and Proportion II

    If a,b,c,d are continued proportion : Prove that : (\frac{a-b}{c}+\frac{a-c}{b})^2-(\frac{d-b}{c}+\frac{d-c}{b})^2=(a-d)^(\frac{1}{c^2}-\frac{1}{b^2})^2 After solving LH.S I got : \frac{2(a-d)}{(bc)^2} But after solving R.H.S I am getting \frac{(a-d)^2(b^2-c^2)}{(bc)^2} Please help further..
  19. S

    Ratio and Proportion

    If \frac{x}{(b+c-a)}=\frac{y}{c+a-b}=\frac{z}{a+b-c} Prove that (b-c)x+(c-a)y+(a-b)z=0 If we add the numerator parts and denominator parts we get : \frac{x+y+z}{a+b+c} Can we do it this way... please help further. Or : multiplying numerator and denominator with (b-c) of : \frac{x}{(b+c-a)} =...
  20. J

    ratio and proportion help

    my professor doesn't really believe in teaching... he assigns homework and expects us to figure it out so we can talk about it in the next class.... Not my idea of great teaching. I'm lost on a question. Any help would be appreciated. The distance necessary to stop a train at a given speed is...