science

  1. I

    The Unexpected and Thrilling life of Grass - A Statistical Story

    Hi, I'm an aspiring Environmental Scientist and i've recently finished some data collection to do with Common Grassland Species. My hope was to match my findings against a Botany report done several years ago to see the change over time. However i can't figure out which tests to use as most...
  2. A

    Aggregate Loss Model (Actuarial Science)

    Question: Let S be the random sum of N independent frequencies {{M_i}} where N is negative binomial distributed with r = 5 and \beta= 3 and {M_i} is Poisson distributed with  = 3. Find F_S(3) Attempt: I know the formulas for these two distribution, but I am totally lost of how I...
  3. M

    Chi squared troubles

    Okay, so i have been given an assignment in uni were they give us a set of data and we have to write up a scientific report. I have to perform a chi square test on the results in the hopefully attached table. I'm unsure about a couple of things: 1. Are my expected results obtained by using...
  4. 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...