1. J


    I am writing with regards to a data set for wine characteristics, for 1600 different wines, each with a value of pH, acetic acid concentration (mg/L) and quality from an ordinal likert 1-10 ranking scale from a taste test. The data for acetic acid is heavily negatively skewed and the pH is less...
  2. N

    What statistical tools should I use?

    Hi, I need help for my thesis. I consulted with 2 statisticians and they gave me different results. So, basically, my problem is to know if independent factors (ex. sex, age, educational attainment, type of employment (direct/agency), years of teaching experience, etc.) influence the salary of...
  3. R

    A/B testing (experimentation) question

    I am new to A/B testing and experimentation. I have 2 questions. Any help is appreciated. Question 1: I need to test 3 versions A, B and C. My first option is to run A vs B and the winner vs C. Another option is to run A vs B vs C. What things should I consider when comparing these approaches...
  4. A

    Compare 2 box plots

    Hi all! For my stats project, can someone help me compare these two box plots please? Thank you very much. (An image is attached)
  5. R

    statistics and probability question

    Winnipeg has three professional sports teams - the Winnipeg Jets hockey team, the Winnipeg Blue Bombers football team and the Winnipeg Goldeyes baseball team. Suppose we have the following information about Winnipeg residents: 55% are Jets fans (J) 40% are Bombers fans (B)...
  6. R

    Z test or T test?

    Looking at a spider diagram I assumed that i should use a Z-test for this hypothesis test however the solutions are saying a T-testing using an F-test to see if the variances are the same. Someone please help me understand :shakehead:shakehead . A survey was conducted on attitudes towards...
  7. J

    Quick question

    Hey everyone, I'm having some trouble with a Intro to Stat question I have for homework. I'm hoping someone can help me out with this. I'm not looking for the answer I just want to be pointed in the right direction, this one has me totally stumped! For a population with mean equal 70...
  8. L

    Chi Squared Distribution using R

    Hi. How do I calculate P (1<x<4) for a chi squared distribution with degrees of freedom = 3 using R Programming ? What commands in R should I use for specifying the 2 intervals ? I tried using chisq, pchisq . I am not sure how to specify the command for continuous intervals. Any help would...
  9. N

    Distributions with different shapes in Mann-whitney

    Hey guys.. I'm working on this research and using Mann-whitney U test for data analysis. I encountered this situation where the shapes of the distributions of the two variables are completely different. What should I do in this case? And also, if this is the case, doesn't it mean that I...