group means

  1. A

    How do I compare between-test changes in mean across groups with different starting means

    I have 10 groups that took a test at two different points in time. Each group had a different starting mean. i think my null hypothesis is that all groups improved the same amount relative to their first test mean. I am confused about how to actually compare the differences in means across the...
  2. J

    correlation between group/factor level & individual scores with group means and MSE

    Hi everyone, I've been working on this problem for a couple hours now, and I'm stumped. Essentially what we have are 4 groups of 25 people each. The groups are formed around a sales goal for each group ($10k, $20k, $30k, $40k). We don't know the individual scores within those groups, but...