size

  1. J

    Questions about determination of sample size

    A.) A recent record shows that 35%of the people in Japan were suffering from depression. What sample size is needed to provide a confident of 99% that the point estimate is correct to within ± 0.03 of the population proportion? B.) Without the record of A.), What sample size is needed to...
  2. A

    Calculate the TV size, based on distance from TV

    Hi all, Assuming that a 124cm width screen is preferred when sitting 308cm away from the TV, what formula can I use to convert any distance to get the new desired width? Would be greatly appreciated if the formula was in layman/excel terms. Thanks!;)
  3. M

    determinant of symmetric matrix of size (n+1)(n+1)

    Let for j = 0,. . . n aj = a0 + jd, where a0, d are fixed real numbers. Calculate the determinant of the matrix A of size (n + 1) × (n + 1)
  4. Chemist116

    How to find the length of an iron bar when it is given as a function of its size but

    I'm not very sure how to solve this problem, but it looks to be related with division of polynomials. Can somebody give me some help with this?. The problem is as follows: In an auto factory in Hsinchu, a technician is in charge of a robot which its function is to cut steel bars for a coupé's...
  5. M

    Calculating the size of the radial shadow that a manifold casts

    I have a question about this problem and I want to understand it, but I'm not sure if my logic is solid. The question is: >Let M be compact, connected, oriented surface with boundary in $\mathbb{R}^3$, and $(a,b,c)$ not in M. Define:$$\Omega_{a,b,c} = \int_{M}\omega_{a,b,c}$$...
  6. R

    No simple groups of size

    Please help - what do I do when 128 is just 2 to the power 7?
  7. Z

    Effect size for t-test

    I downloaded some sample data from Wikipedia and tried some statistical analysis in R: https://drive.google.com/open?id=0B9wG-PC9QbVETjJGX0RoOTRpWUU (https://drive.google.com/open?id=0B9wG-PC9QbVESjVxbDljZ0FvUmc) But I have a question. On this page: Quick-R: Power Analysis it says "Cohen...
  8. S

    sample size determinant

    Hi everyone, I'm trying to determine a sample size. I am listening to calls to a Contact Centre from customers with Internet Banking or a banking app. I'll be listening for 3 different areas. area 1 gets 3.3 million calls annually area 2 gets 1.3 million calls annually area 3 gets 800k...
  9. S

    Sample Size and Sensitivity/Specificity

    1,765 patients were given a positive/negative screening test for a disease. N = 415 patients tested positive N = 1,350 patients tested negative Due to constraints, not all 1,765 patients were given the definitive disease diagnostic test; clinicians had to pick a sample size (95% CL, 5% MoE)...
  10. S

    Sample Size and Margin of Error

    I'm crafting a study and am not sure if the below hypothetical approach is right: A robotic eye scans man made machine parts for defects. 500 machine parts were made in Feb 2016. A human inspector takes a sample size of 218 and manually inspects for defects. Inspector finds 10% of machine...
  11. S

    axiomatic descriptions of even size or odd size

    As I just known what is axiomatic descriptions, I still confused about how to description. Can someone help to give the axiomatic descriptions for even size or odd size to let me know it clearly. TY.
  12. M

    Times 2 infinite progression of size

    Shown is a times 2 or one half infinite progression of size, or area. This when using triarcs. Please note that the biarcs in each circle containing the triarc, have or are biangular biarcs. This shows one arc of the biarc as 120 degrees, and the other arc is 60 degrees. Or a exact times 2...
  13. T

    sample size for confidence interval of proportion

    Question: A state legistlator wishes to survey residents of her district to see what proportion of the electorate is aware of her position on using state funds to pay for abortions. What sample size is necessary if the 95% confidence interval for p is to have width at most 0.10 irrespective of...
  14. T

    sample size for confidence interval

    Question: A state legistlator wishes to survey residents of her district to see what proportion of the electorate is aware of her position on using state funds to pay for abortions. What sample size is necessary if the 95% confidence interval for p is to have width at most 0.10 irrespective of...
  15. A

    Find max size of clique in permutation graph

    Hello, I have following problem. I have following graph: 1 3 1 5 1 4 2 4 2 3 2 5 3 4 which looks like below I want to calculate permutation for this graph. My result is: (4 3 5 1 2) But it looks that is wrong answer. Size of the largest clique in permutation graph is...
  16. D

    investigating appropriateness of sample size

    i need help with the last dotpoint on the attached sheet, where it says "investigate the appropriateness of the sample size using math evidence" I think i sort of have an idea of what to do, but not entirely sure. Do we use the central limit theorem? Do we use the sample size equation...
  17. R

    How many red cube can surround a blue cube?(all equal size)

    Question taken from--> https://brilliant.org/profile/calvin-8u8hog/sets/calvins-picks-level-5-challenges-2015-xxiii/299119/problem/he-was-wrong-too/?group=3BX9rjPrQ3CM You have a (solid) blue cube and an unlimited amount of (solid) red cubes, all of which are of the same size. What is the...
  18. L

    Vandermonde matrix- can be of any size?

    Vandermonde matrix - Wikipedia, the free encyclopedia Can this matrix be, for example, 2X3, 3X2, 4X6 (as long as it has geometric progression in each row)
  19. U

    Finding Maximum Size

    Hi I'm having trouble finding out a way to solve my problem. Can someone help point me in the right direction please? My problem You are to mill a beam from a cylindrical wooden log. The strength S of a beam is proportional to its width (w) and to the square of its depth (d). What is the width...
  20. D

    Mathetical Model of Cow herd size after n years

    I am trying to figure out a formula (mathematical model) for cow herd size after n years starting from a single cow 4 years old. Provided: A cow starts giving child after she becomes 4 years old. Every years she gives one child. Take 50% male and 50% female new born cows. Take lifespan of...