binomial

  1. C

    Need help starting this question; unable to identify what type of question it is

    I can't tell if its asking for a binomial distribution or a normal probability distribution.. or maybe an approximation of a binomial distribution using a normal distribution..but then where does a random variable come in? here is the question: A company that manufactures mufflers for cars...
  2. A

    Negative Binomial Distribution

    Hi, Regards
  3. S

    A/B/C Conversion Optimisation

    Hi All, I'm trying to understand the process behind testing both A/B site changes for statistically significant increases in conversion rate, and also how then to expand this to testing multiple variables. My understanding is that this is a binomial distribution (n=visits, p=conversion...
  4. S

    Multiple Inter-Correlated Binomial Events with only One Event Possible for Success

    Hi you’ll, I have a thought problem that might not have an easy/correct answer. It looks to be a Bayesian at first glance – and it might be – but because I am using some complicated machine-learning algorithms, and because of the nature of the problem, the water are muddy for me. I am just...
  5. S

    Are McNemar's and Binomial the right tests for my data

    Hi everyone. I have performed an experiment, where I have real and synthesised movie data. My participants were shown either a real movie, or a synthesised movie (of talking heads), in a random order, and had to guess whether the movie was real or synthesised. I have 17 participants, each...
  6. B

    Binomial formula - solve for N help ...

    Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula: [URL="http://www.mathwords.com/b/binomial_probability_formula.htm"]http://www.mathwords.com/b/binomial_probability_formula.htm How would you change...
  7. G

    How to Calculate Z-score of Binomial Test?

    Hello. I would like to ask how to calculate the z-score of a Binomial test? I am using this http://www.elderlab.yorku.ca/~aaron/Stats2022/BinomialTest.htm link as a reference. I don't get its assumption (second sentence of step 2). I've searched about the formula for this but still I don't...
  8. M

    Interpretation of GLM output for binomial family

    Hello everyone, I need help interpreting GLM output for binomial family and determining if this GLM is the correct one to use according to what I need to analyze. Noninvasive genetic sampling of a wild cat was conducted to determine sex. Different environmental factors were identified to...
  9. P

    distribution of sum of dependent binomial variables

    I have N bernoulli dependent variables, X1, X2, ..., XN, and Xi ~ B(1, pi), pi is already konwn. And Y=X1+X2+...+XN, I need to get the distribution of Y. If Xi, Xj is independent, then I can use the simulation, generate X1,...,XN using the bernoulli distribution, and get the Y; repeat 10000...
  10. M

    Which test to use - Binomial or Fisher's Exact?

    Hello, I am trying to compare 2 random binary samples, and I am confused on which test to use. This is to test the effectiveness of an algorithm in identifying risk factors in patients. If the patient is diagnosed with at least 1 risk factor that is a success (1) and if they are not...
  11. W

    Error for combining multiple binomial distributions

    Lets say we have two processes and we want to know which has a higher success rate. So we do two sets of trials. process 1 gives 53 out of 606 and process 2 gives 32 out of 595. So p1 is 0.0538 with a 95% CL of [0.0371,0.0751] p2 is 0.0875 with a 95% CL of [0.0662,0.1128] It would seem that p2...
  12. D

    Which statistic should I use for rare events?

    Hello all! I want to estimate the mean prevalence out of a number of studies (8 retrospective cohorts). The sample size in all studies is large N>4000 and the probability of the event small p<1%. Should I use the binomial or the Poisson distribution to estimate the 95% confidence intervals of...
  13. H

    1-bimoncdf vs binomcdf

    Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?
  14. R

    Hypergeometric and Binomial Distributions

    Hi all, I am getting a bit confused with these two questions: 1. 20% of widgets are faulty previously. You receive a lot of 20 widgets. You have tested the first 6 and found that 2 are faulty and 4 are not. What is the probability that you will have at most 4 faulty widgets in the entire...
  15. K

    Alternatives to logistic regression when the number of cases is low

    Hi All I got involved in my first foray into logistic regression, but have come to realize that I probably can't use it. Let me tell you about my data. I am investigating the consumption of 3 different insect pests by bats in an agricultural area. The response variable is binary for each...
  16. M

    Binomial probability with another aspect?

    Assume that the orange widgets are produced independently of each other with the probability of an individual orange widget being good being equal to 0.85. You want to produce at least 20 units, but you don't want to go over 20 units if possible. i. What is the minimum number of orange...
  17. jpkelley

    Variation in inflection point for modeled logistic curve

    Hey all. Question category: R and regression; Posted in R forum since R code. Question: How best to quantify variation in an inflection point for a logistic curve? Background of problem: Birdies begin their birdie lives contained in eggs. Then, they hatch and continue their lives...
  18. W

    Lottery question

    Hey guys, new here. Just wondering if i am playing 23 games in a lottery, and IN TOTAL across the 23 games, the number 1 is drawn 9 times, what is the probability of that occurring? some more info about this specific game, there are 45 balls, and each game consists of 7 balls/numbers...
  19. G

    comparing change from baseline (two treatment groups, binomial data)

    I am comparing the effectiveness of a vaccine in reducing the prevalence of the targeted protein. I have baseline data (before the vaccine was even available), and now have data from vaccinated and non-vaccinated individuals. I have used chi-square/odds-ratios to show that the prevalence of...
  20. F

    Binomial data, proportion comparison

    Hi guys, I’m trying to find out whether the percentage of students who are satisfied with a service (statistically) significantly changes year-to-year. This would be easy enough to do with interval data with a t-test (scale of 1-4, looking at the mean), but I would like to know how to...