1. C

    Choosing a representative reference value

    Hello, let's see if someone can help me with this. I have a data series of a year of road traffic in a concrete point (number of vehicles/day) I want to find a stadistic, like the maximum, the mean, the mean plus the standard deviation or other that represent my data series in most of the...
  2. T

    Mediation analysis for two correlated mediators

    Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the association of two different variables. I have read about mediation analysis with one or multiple mediators, but nothing about an interaction as the...
  3. R

    Estimating the Average and Standard Deviation with Missing Data

    I need a way to shows me how the parameters of PDF, log-normal in this case, can be estimated based on a set with missing data points at the tail end of a sample. For example, Consider we had 20 numbers with specified μ and σ, and then missed two largest number of them. How do we can estimate...
  4. C

    Help with statistics

    Only statistics that you need to calculate for it are the means, standard deviations, and sample sizes. Here are the results: Nutrient Test statistic value P Value Calories 3.984 .000 Saturated Fat 7.613...
  5. A

    Help me w/ stat. project.

    I'm a collage student and my final project is to research any topic, examining a single quantitative measurement and present the results. I'd like to research several aspects in regards to bulling. Such as how much has school bulling increased/decreased. If student victims of bulling graduated...
  6. C

    Parameters estimation.

    It is known that a sample consisting of the values 12, 11.2, 13.5, 12.3, 13.8 and 11.9 comes from a population with density functionf (x, α, β) = ( β/ \α ) (1 /x ^{ β +1}), for x>=1, α>0, β>0. Estimate the values of α and β. Here I have two parameters, and values, do I have to derive first...
  7. O

    Making sense of the data...Data analysis

    Dear Experts, I have data for a 12 months study done on 2 wastewater (Plant A and Plant B—Final Effluent and Discharge Point) treatment plants. Physiochemical (13 parameters tested) and Microbiological(bacterial) data were collected. Also there is the recommended standards against which all...
  8. W

    Someone please help me with these hypothesis testing questiong!!!

    Hi Everyone, I've got an extra credit for my statistic for social science/psychology, and I've barely hitting the mark to get a pass. So I was given extra credit questions. but I don't really know how to do them. Hope someone could really help me on this! Thanks![/ATTACH]
  9. 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.
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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!
  19. 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...
  20. 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...