1. 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...
  2. 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...
  3. 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
  4. 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...
  5. 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...
  6. 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...
  7. 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
  8. 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)
  9. L

    In need of help with choosing a statistical test for dissertation results!!

    Thanks again for the help. Only had time to do spearman's but worked out well
  10. N

    Ranked Data analysis Help

    Hi I need help analyzing data from a survey. i am looking at consumers shopping venue and their confidence in regulation by various industry players. Shopping venues question: please choose your top 3 shopping venues (1 for each and zero for those not chosen) Confidence questions: How...
  11. H

    bayes estimator

    Let x1,x2,…,xn be a random sample from the normal distribution N(θ,σ^2), where θ has distribution N(μ,τ^2) and where σ^2, μ and τ^2 are known. Find a Bayes estimator δ of θ under the loss function L(θ,δ)=1−exp(−(δ−θ)^2/2γ^2) where γ is known
  12. H

    unbiased confidence interval

    Hi let x1,x2,...,xn be a random sample from distribution in under function distribution . F(x)=[(x/θ)]^β , 0≤x<θ where β is unknown and θ is known find a unbiased confidence interval in level (1-α) for β
  13. I

    Correlate a continuous with a binary variable

    Hey everyone. I have a simple problem and was hoping to get your advice with. I am trying to correlate a continuous variable with a binary one. Let's say the binary variable represents a Yes/No option and the continuous just a number between 1-100. How should I go about doing that? I...
  14. N

    Significance test for differences in baseline and re measurement rates

    Hi, I need help in knowing which test to perform with this analysis. I have two groups (lets say group A and B). A study was performed with initial rates of heart failures in group A and B (i.e, baseline rates) were measured. After 6 months of follow up the heart failure rates in group A and...