t distribution

  1. M

    What is the Confidence interval of this...?

    HI Friends, I've attached excel sheet having 19 records. Can you guys pls help me in finding 95% confidence interval for this. I tried finding it all way, but I'm not getting correct answer. Should t- distribution or Normal distribution be used..? I Thank in advance. Pls help me in finding...
  2. J

    Using Apache Commons T Distribution cumulative probability to find p given DF and t Value

    [org.apache.commons.math3.distribution.TDistribution] Hello, I am writing a program for statistics and am don't have a very in depth knowledge of p value; I understand what it is so maybe it is that I don't understand cumulative probability and how it gets me a T Value. I've only taken...
  3. H

    T distribution

    1. True or False: For a t distribution with 12 degrees of freedom, the area between 2.6810 and 2.1788 is 0.970. 2. True or False: For a t distribution with 12 degrees of freedom, the area between -2.6810 and 2.1788 is 0.970.
  4. Z

    Plotting in r

    Hi There I've goodness of fit my data 2 times. one time for normal distribution and another time for T.distribution. I have about 2500 data and I need to do graphical illustration now. my graphical illustration should be mix of ecdf and cdf for each of them( normal and student t). I'm pretty...
  5. L

    Calculate population cumulative probability from sample

    Hi all, I am currently working on an assignment that involves inferential statistics. Basically, I am given a sample of 30 people with their heights and I am asked to calculate the confidence interval of the population and the population cumulative probability of people who have heights over...
  6. B

    T distribution - basic question I think

    Hello, Is it possible to use a t test to test whether an individual observation is from the same population as a (small) sample?
  7. M

    Statistics Problem

    Hello, I am trying to solve the problem below but am not sure how to go about it. Does anyone have any ideas or advice on how to solve this problem? Let X~N(3,5) and Y~N(-7,2) be independent. Find values of C1,C2,C3,C4,C5,C6 such that C1(X+C2)^C3 -------------- ~ t(C6) (Y+C4)^C5...
  8. T

    Accounting for confidence intervals in determining a mean

    I have received some elemental analysis of a metal which I want to use to determine the effects of radiation. I want to report my results for the mean and 90% CL. The analysis only presents 8 data points for each element so I was planning on using the t distrobution as follows...