t-test two-sample

  1. confused_pleasehelp

    two-sample assuming unequal variances - too sensitive?

    Hi there, I'm comparing image values in a tumour region before and after treatment. I'm trying to see if the value of the pixels is significantly different after treatment. The histogram distributions look like this (for one tumour): I assumed using the 'two-sample test assuming unequal...
  2. LostLizzy

    I am so lost about what test to use... Help!

    I am in the process of comparing the difference in times to complete a task between two groups... I thought that a two-sample T-test would be best but I am rubbish and keep second-guessing myself! HELP! o_Oo_Oo_Oo_Oo_Oo_Oo_O
  3. H

    Paired T-Test

    I am trying to see if there is a strong correlation between two datasets, but I am not confident that the paired t-test could be used. The first dataset is a score from 1 to 6 and the second set is percent grade received from a score. I am trying to determine if those with a higher score tend to...
  4. R

    Comparing pooled variances?

    Hi all, I have a problem where I want to prove that the data belonging to invidivuals of one group has a higher variance than the other. The experiment involves a parameter of movement that changed in one group of organisms, but without a clear trend. The parameter remains stable in...
  5. C

    How to report t-test, CIs, cohen's d etc of log-transformed data

    I am wondering what is best/normal practice for reporting the results of an independent t-test of log-transformed data? For context, I am comparing the value of household assets for children who are attending pre-primary school with children who are NOT attending pre-primary school in Uganda...
  6. T

    Two sample t-test between percents in Python?

    Hi guys, I have a bunch of data in the following format (sorry, it does not format well on here): Key Indicator-----------First Group------------Second Group ------------------Observations---Mean-----Observations----Mean 1 Grade change...
  7. E

    [SPSS - T-Test] - understanding how to approach a question

    Hello, I have I inputted my data into SPSS. This is the question that I have been given: Compare the QABF attention(interval data)scores and demand(interval data) scores of people with a diagnosis of FXS and those with any diagnosis. Are people with FXS more likely to have lower...
  8. B

    t-test for large sample size - bike hire data

    Hello everyone, I'm taking a graduate-level statistics course at the University of Glasgow which includes a methods assignment. The assignment requires us to correctly execute several statistics, including one and two sample t tests. To complete my assignment, I'm using a large dataset...
  9. L

    Repeated measures when pre/post group is not independent or dependent

    Hello, I am running a pre-post study using several different instruments (e.g. 1-5 Likert scale instruments which produce a final score). It is being done to a group of employees at a hospital pre and post a new intervention approach with patients. However, as some of the questions on the...
  10. S

    Bootstrap procedure to test difference between correlation coefficients

    Hi everyone, I have two correlation coefficients (r1 and r2), obtained within the same sample (20 subjects). My aim is to test it they are significantly different. r1 is the correlation between a neurophysiological parameter and a behavioural parameter in condition A; r2 is the correlation...
  11. galegirly

    what type of statistical analysis would you apply?

    I am a teacher. I've done pre and post intervention testing with a group (n=17) of pupils. I also did the same tests with another group (n=17) who had no intervention, they just had business-as-usual teaching. Whats the first thing you would do - compare the initial test scores for the two...
  12. C

    Which test should I use?

    Hello, I'm writing my thesis and I'm clueless about which statistic test I need to apply ( is it T-test, Chi-text, Anova …), I will do my ststistics on SPSS. In my thesis I have 2 sets (=2 groups) of patients with the same disease, one group gets a specific treatment , while the second group...
  13. P

    Please help a very confused Paramedic Student

    As part of my final year Bsc degree I am writing a research proposal. HOWEVER I am struggling to wrap my head round which statistical test would best suit my data. The Research is an RCT with an intervention and a control group (2 groups). I would like to compare the incidence rate of...
  14. S

    Unique " t - test" - Kindly help

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some independent variables ( X ). The predictions of the two theories are mutually exclusive , i.e. if one theory predicts a positive relationship between Y...
  15. P

    I'm Confused Between Independent T-Test, Mann-Whitney And Chi Square Test?

    hello everyone, i need your help regarding these statistical tests since i'm not really big on stats. i want to know if there are any significant difference between the two groups in my study. i'm confused which statistical treatment i will be using. here's a little background on my study. i...
  16. C

    T test with unequal sample sizes

    Hi there, I need to compare if the mean of my sample (n=74) is significantly different from the mean of the standardization sample (n=300) (the one that comes in the manual for the measure I am using). I only have the mean, SD, and sample size information for the standardization sample...
  17. T

    t-Test Two-Sample

    Hi, I perform t-Test Two-Sample in Excel using the Analysis Tool pack. I used both methods: 1) Assuming Unequal Variances, 2) Assuming Equal Variances. I get in both cases that they are significant. How can it be? The H0 assumption is opposite in both cases. Isn't it? Thanks, Tamiri