1. Jennifer Murphy

    Help understanding Excel's PercentRank.Inc vs .Exc

    In the olden days, Excel had just one PercentRank function. It now has 2: PercentRank.Inc (replaces PercentRank) and PercentRank.Exc. I understand how they work. I do not understand why they work the way they do and why I would use one vs the other. This MVP says that the old function and the...
  2. J

    Comparing percent suppression of proliferation

    Hi all, I am study a cell type (MDSC) that are known to suppress the proliferation of immune cells (mainly T cells). In order to test for suppression, we do what we call a 'suppression assay'. In this assay, we use 3H-thymidine incorporation to measure (a) proliferation of stimulated T cells...
  3. S

    probability problem that's been messing with my head. Please at least look at it

    I'm taking a liberal arts math at my college and the teacher gave us a take home test. There is one probability problem that's just not clicking. Here is the problem and what I have done so far. A person purchased 10 of the 1000 tickets sold for a raffle. To determine the five prize...
  4. N

    t-test on percentage

    Hi all, Pretty simple question: I have two mean performance scores in percent, one is 70% +/- 3(SEM) and one is 95% +/- 1. Someone said I shouldn't do a t-test to compare these since data can't be normally distributed. Is that true? How would I compare these means then? thanks!
  5. K

    I really need help on my homework!

    Theres 2 questions I'm really stuck on. One has three parts and is of course one of those "you can't do the next step until you get the first step" kind of thing.\ 1.A set of reading scores for fourth-grade children has a mean of 25 and a standard deviation of 5. A set of scores for...
  6. 7

    Linear R^2 Values as Percent Weights for Multiple Variable Formula?

    Hey guys, Statistics is not my strong suit.. The closest I've been to statistics is a college level Biology II class I took three years ago.. But I'm trying to learn. I have a website and two mobile apps where I've been collecting data from people for the past 5-6 months and would like to...