basic statistics

  1. C

    Understanding the use of the standard error of differences between two means (SEDM)

    Hello everyone, I am currently learning statistics using Van Emden's "Statistics for terrified biologists". I am trying to solve some exercices that the book offers you. One of the questions (1b) in the "Spare-time activities" section asks to find out if a mean value of 240 coming from the...
  2. M

    Help ! I need advice on basic statistical problem

    This may be a really easy question , or it may not be possible I just don't know.... I conducted a test whereby I obtained 100 repeats of a single sample, lets say values ranging between 33 and 35. Using this data set is there anyway to calculate the approximate range I would expect to see in...
  3. J

    Comparing data sets with two very different samples sizes - stats newbie

    Hi, I realize this question might have been asked before, or is very rudimentary, but I'm having trouble figuring it out. I have several data sets (~50) comparing outputs from two different brands of product from different areas of the country. The issue I'm coming across is that for Brand A I...
  4. D

    Computing an average for a data set that contains NULL values

    Hi all! We are working on some software that shows the mean for a set of students. Currently, the calculation is being done in a manner that includes the students that haven't yet been graded. I have questioned the logic that our developers used and they have asked me to validate the...
  5. S

    Does my research proposal make sense? [Basic Stats]

    Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as much as possible. I would love to have inputs by you experts on my project proposal and the analysis I have in mind. The research purpose of my...