problem

  1. M

    comparing two proportions - testing problems

    hi guys.. base data: only average proportions and sample sizes, issue: comparing specifical mortality in 8clusters with county chosen test: chi-square of proportions via contingency tables alpha=0,05 problem: cluster1 cluster8 county proportion in %...
  2. N

    Conditional Probability Problem Help!

    Hey guys, I got this question as a practice problem. I believe that it's a conditional probability where I should find the probability of NOT selecting one-half gallon carton. Can someone confirm if there is a typo in this question/is it solvable? Because it doesn't state the sample size to...
  3. K

    Probability of a Poisson Distribution without t given problem

    This is on my final exam study guide for statistics. I have absolutely no idea how to do it Problem 1: Valerie Variance is taking her "no-time limit " final exam. As always, the exam has an infinite number of questions and the instructor gives no partial credit. Valerie being a diligent...
  4. C

    Suitable Model

    Hi all, I wonder if anyone could help me, i'm looking for an idea or two :) I work in the financial sector and we are looking into ways of predicting the behaviour of customers following changes to rates on some of our products. The current process involves looking at previous rate...
  5. M

    Skewness in SPSS - SPSS answers differently in multiple PC

    'm wanna calculate the Skewness of 10 data(number); But SPSS calculate it differently in multiple computer!!! The Numbers: 239.00, 176.00, 235.00, 217.00, 234.00, 216.00, 318.00, 190.00, 181.00, 225.00. I followed this steps: Analysis--->Descriptive...
  6. J

    Simple Probability Question

    OK, so I am wondering about something and am not good with probability, but maybe someone here has the answer You have a die with only 4 sides, with the numbers 1-4 written on the sides. You roll the die 5 times. What is the probability of the number 2 showing up: Once? Twice? Three times...
  7. N

    Not Homework, but need smart explanation. Trying to figure out payout of certain bet.

    There is a "money wheel" with 50 slots of dollar amounts the spinner can land on. The dollar amounts are 1$, 2$, 5$, 10$ and 20$. (The larger the dollar amount the higher the payout but less slots there are for it on the spinner therefore less likely to land on) ex. If you put one dollar on the...
  8. T

    Choosing the correct Statistical test

    I am writing my first year project about working conditions in Denmark and have done some statistical analysis. But I am in doubt whether I have used the right methods. The reason behind my despair is my absent teacher which resulted in a huge lack of guidance. (Enough self-pity) My problem is...
  9. S

    Help with Sample Space question.

    Q: There are n marbles in a bag and k(k<n) of these marbles are marked. i) Marbles are drawn from the bag at random (without replacement) until one marked marble is dawn. Write out the sample space for this experiment. ii)The experiment is reset and this time marbles are drawn until all marked...
  10. 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...
  11. C

    finding the effect of X on the relationship between Y and Z

    I had a huge explanation and it got deleted, so here's a briefer version: I'm trying to find whether high trait empathy predicts a greater effect of self-other differences in status on state empathy and helping. I have differences coded as -1/1 (diff/sim). In the zero-order...
  12. N

    Error with multinomial regression when using weight

    Hi, I'm conducting a multinomial logistic regression on some British Crime Survey data. For this analysis I need to weight the dataset in order to account for sampling biases. The problem I'm having is when I apply the correct weight and run the multinomial regression, my model fitting...
  13. S

    Regression Model is not full rank

    Hi all, I am trying to detect relationship of crop yield at the end of the growing seasson (1 dependent variable) using amount of precipitation in May, June, July, May+June, June+july, Temperature in May etc. The problem is that I can't get p-values for many of these variables because of the...
  14. O

    Conditional Multivariate Probability

    So, I got this from my textbook and it makes sense: P_{Y|x}(y)= P(Y=y|X=x) = P_{X,Y}(x, y)/P_X(x) But I'm trying to apply it to this question and I'm struggling. Here's the question: Suppose a die is rolled six times. Let X be the total number of 4’s that occur and let Y be the number of 4’s...
  15. 1

    Multiple Regression Analysis Issue

    Hi everyone I have just signed up! I am currently doing a thesis & struggling with my regression model. I am examining the link between profit levels debt levels in the oil and gas industry. My Dependent variable is Profitability, Independent variables are Debt/Size of company/Growth rate of...
  16. K

    Simple Random Sample vs Random Sample

    Problem: "A computer company employs 100 software engineers and 100 hardware engineers. The personnel manager randomly selects 20 of the software engineers and 20 of the hardware engineers and questions them about career opportunities within the company. Does this sampling plan result in a...