t test

  1. S

    Fishy problem- which stat is appropriate? t-test or mann whitney

    Hello kind stats people, I'm in a bind! In my PhD I'm studying fertilisation success of 2 species of fish when they mate with each other. So how does mating success as a hybrid compare to that of the pure male. And just to complicate things I have them mating in different orders to see if...
  2. B

    a series of T tests more appropriate than ANOVA here?

    Hi all, I'm writing up some experimental results, which I believe I know how to analyze, but wanted to get some frank and impartial feedback before I defend myself. I'm testing an insect to see if it is restricted to only one host plant. In the first experiment, I have two controls, one in...
  3. N

    Which T-Test is appropriate

    Hello, I am trying to determine the effectiveness of one method versus another on the same data set, but I am confused which of the types of t-test I can use. I have heard about two-sample dependent t-test and two-sample independent t-test, and others, but to be honest I am confused. So, to...
  4. C

    Paired or unpaired test?

    Forum experts, I'm doing some environmental data anlalysis and I'm struggling with the correct statistics approach. I have data from 4 3-week studies where a number of parameters were collection both upwind and downwind of an emissions site. I have 1-min data that I have also averaged into...
  5. D

    Combined t test for intercept and gradient - Unequal sample sizes, equal variance

    I work in an industry where sales are related to temperature. My colleague has performed two regressions for sales: Monday to Thursday sales= a1 + b1*Temp Friday sales = a2 + b2*Temp I'm trying to determine whether Friday Sales are the same as Monday to Thursday sales. By 'the same' I...