1. H

    a question in uniform distribution

    suppose X1,…,Xn be random sample of U(0,θ) distribution. if X(n) be largest order statistics of sample, and V=nX¯/X(n), how can I calculate Var(3V−X(n)) X¯ is mean of sample.
  2. E

    Risk probability assesment

    Your exam could be marked with a range of possible grades, simplified as on the following state diagram: Acceptable To begin with the chances are that you will pass with a standard result. Each 45 minutes (the time allocated for each answer) your grade could go up or down to a...
  3. E

    Matrix representation

    A very new European “Rapid Reaction Force for Fire” has been created today and begins operation between three Countries “A”, “B” and “C”. It’s main resource is a super aircraft “Funderbird2” with a massive water cannon that even carries a small mini-submarine for fighting fires at sea...
  4. M

    How to I Calculate the Missing Values?

    IQ-scores are standard-score transformed scores having a mean of 100 and a standard deviation of 15; SAT scores are standard-score transformed scores having a mean of 500 and a standard deviation of 100. In what follows, X refers to a raw score from a distribution with a mean of X and a standard...
  5. T

    Multiple Regression Help

    Hello, I need help/advice with multiple regression analysis. I am looking at the degree of discrimination towards women in construction industry in terms of salary, promotional opportunity, harassment and psychological environment. Data that I have collected are -Age -Level of...
  6. T

    Need help with regression analysis

    Hi everyone, I am kinda confused with regression analysis. My research is to investigate the degree and trend women in the construction industry suffer from lower wage and harassment. What I got here is a dependent variable (Salary) and independent variables 1. Gender 2. Years of working...
  7. K

    What asymmetric distribution represents this data?

    Hello, I have this data: Bin particle_240 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 2 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 1 19 3 20 1 21 2 22 3 23 10 24 8 25 6 26 5 27 7 28 14 29 11 30 14 31 14 32 16 33 17 34 12 35 17 36 16 37 17 38 26 39 19 40 26...
  8. J

    compare two Beta coefficience between two different model.

    I am running two regressions, each with the one independent variables (Y) but with two different dependent variables (X1, X2). examply: Y is central obesity, X1 is waist circumference, X2 is waist / hip ratio. I think the waist/hip ratio more good indicator than waist for central obesity...
  9. M

    PhD study

    Dear individuals of intelligence, I would like to know if anyone can help choose the correct statistical test to carry out on my data that I have collected. Details are below: I tested 10 caucasian, 10 asian and 10 african individuals during a cold water immersion and measured their skin...
  10. R

    Which formula to use

    Hi, I have 2 columns of numbers (x,y), I want to find which value in column X will give the maximum value in column Y. What formula does it? preferable ones that can be used in Excell or OO Calc. Thanks!
  11. A

    Comparing Survey Results

    I just recently administered two surveys testing the effectiveness of a product. Each survey consisted of the same 3 questions and were answered on a 10-point Likert scale. Survey A was given to 20 participants before the product was administered and the answers to the questions were as...
  12. K

    Sst= ssw+ssb

    Hi everyone, I have this problem to solve. It's been a while since I tried to figured out how to do, but I am totally lost. Here it is. Prove SST= SSW+SST in one-way Anova (one factor). Σ ( xi - x̄ )² = Σ (xi - x̄ + x̄ k - x̄ k ) ² Hint: Σ [ ( xi - x̄ k ) + ( x̄ k - x̄ )]² Where...
  13. K

    Properties of Sample Proportions

    A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they will only consider proceeding if the true proportion of apartments that prohibit children is more than 75 percent. Suppose that out of 125 sampled...
  14. L

    Help on Ratio

    Can anyone help me? For example, I have a store, 4 people bought iPhones and each buyer bought accessories too. Buyer#1: 1 iPhone, 4 accessories Buyer#2: 2 iPhone, 6 accessories Buyer#3: 2 iPhone, 4 accessories Buyer#4: 4 iPhone, 9 accessories What is correct: 1. The Ratio of...
  15. H

    order statistics of random sample

    suppose X1,X2,…,Xn is a random sample of distribution with positive values where E(X)=Var(X)=1. We show order statistics of this random sample with Y1,Y2,…,Yn. How can show 1. E(∑(Yi/Xi))≥n 2. E(∑YiXi)≤n+n2
  16. A

    Lottery 'week intervals'

    This strikes me as an interesting (though potentially tricky) lottery question that I'm having trouble getting my head around. Many state lotteries provide 'ball history' tables on their websites listing each number and the draws that have elapsed since it last came out. Players then tend to...
  17. L

    Using R for statistics and probability need guidance.

    I am very confused on my statistics and probability class and i need some help im using the R program i understand a little bit but there are some problems that give me headache. Ex: Question: Suppose there are 10 students attending a class in the computer lab. Determine the probability that...
  18. K

    statistic and probability is is correct?

    Can someone tell me if this is correct? four American, three Italians and three Germans are seated at random in a row. what is the probability that 1) those of the same nationality are seated together? 2)Germans are seated together and non-German are seated together solution: sample space 10...
  19. H

    finding UMVU estimator of θ^2

    suppose X_1,…,X_n be a random sample of distribution with probability density function f(x)=2/θ *x* exp(−(x^2)/θ),x>0. how can i find UMVU estimator of θ^2
  20. H

    finding UMVU estimator of parameter γ(θ)

    suppose X_1,X_2,…,X_n,X_{n+1} be a random sample of distribution N(θ,1). if γ(θ)=P(∑Xi>X_{n+1}) (i=1,2,...,n) how can i find UMVU estimator of parameter γ(θ)