engineering

  1. A

    statistics for engineers question please help

    I need to write an original question. I will use your answer as a guide to write an original question by myself. I couldn't find a guide or some examples from books or videos. I would reallly appreciate if you know and let me know where I can also find some examples . I dont know where or how...
  2. B

    What Statistical Designs should I use?

    Hi! We're making a Design of Experiment that involves the use of rubber band and egg shell to see of it affect compression strength of a concrete. So, we make a proportion of the cement and two control variables in interval like 1. 100:0:0 2. 50: 50 :0 3. 50: 0: 50 4. 50: 25: 25 5. 50: 75...
  3. M

    Statistically Significant Data for Test Engineer

    A common engineering experiment is to test something until failure to determine its ultimate break strength. Sample sizes can range from 5 to 100 pieces. I would like to know what statistical tests are used to make sure the data is good. Statistical tests that I am aware of are used to...
  4. M

    Mechanical Engineering Sample Test Size

    You need to conduct an engineering 3-Point Bending. How many samples should you test? I was recently asked this in an interview but was not sure how to answer. I tried saying that it would depend on time, the readiness of the samples, and the cost of the tests but the interviewer said to...
  5. R

    Help regarding th topic: Shrinkage Precision Matrix Estimation with Application

    'Shrinkage Precision Matrix Estimation with Applications to Beamforming' or 'Shrinkage Estimation Precision Matrix with Applications to Beamforming'. I need help urgent regarding this topic. Any help like resources, references or how to solve this topic assignment please provide.
  6. J

    Engineering research tests: comparing post hoc data and paring

    Hello - I have several tests to do but my stats is a bit rusty... They are all based on the deflection of different beam designs: Test 1 Beam design A (n=4) is loaded and deflection measured Beam design A (n=4) is loaded, but with a changed contact, and deflection measured Test 2 Beam design B...
  7. D

    Conditional probability

    Hello, I'm having an issue with a problem. I just have no clue how to solve it. A machine part may be selected from any of three manufacturers with probabilities p1 = 0.25, p2 = 0.50, and p3 = 0.25. The probabilities that it will function properly during a specified period of time are 0.2...
  8. B

    [Discrete test sample size] Number of samples to test after failures occur

    Hello, I work as an engineer at a large manufacturer and we typically use high stress tests on new products to discover failure modes. Sometimes when we have failures, we attempt to fix the problem and want to re-run the test to see if we were successful. The most obvious question then and...
  9. S

    Combination of families of fragility curves (cumulative probability functions)

    Hi guys, I am a geotechnical engineer and currently involved in a project for risk calculation of an embankment dam. It's my first post here, I am still novice to probability theory and statistics. I hope I will explain well what my problem is and I'll be glad if you can give me advices. Sorry...
  10. K

    Equality of Variance for Paired Data- alternative for Leven's Test?

    Hello, I have set up an experiment that tests 3 instruments on 35 different people. Each person gets tested three times with each instrument (see below). Now i understand this is paired data, i was just wondering whether there is a statistical test to check for equality of variance. From...
  11. S

    Can a new tool detect difference between two means with same effectiveness?

    Hi all, I have two gels of different crosslinking densities (gels A, n = 3, and gels B, n = 3). The gold standard test of substrate MODULUS detects muA = ~4 and muB = ~8. I invented a new engineering tool that calibrates the shear STIFFNESS of a sample (related to modulus through an...
  12. E

    Interpreting FFT of biological data

    Hi all, I'm a biological scientist and I'm trying to interpret a FFT of some biological data. Background: I have monitored the length of time an animal stands over six days, so every time the animal stands up we have a time code for when the behaviour started and a duration of how long the...