t-test

  1. S

    Dissertation Results Comparisons - which SPSS method should I use?

    Hi everyone, I'm in my final year as a Psychology student aspiring to be a cognitive neuroscientist (accepted to birmingham university provided I get my 2.1 class honours :D), firstly I'd like to thank you for your time to read this (especially since there is a lot of reading to be done, I...
  2. F

    Which test would be appropriate to test multiple variables?

    I have a data on users with 5 personality variables. The users had to pick a logo for three different projects (most likely, may be, least likely). The question is why the users chose the logo they did - is it the color, the shape, etc. There are 3 data sets - the personality test results...
  3. E

    Is t-test appropriate for comparing percentages?

    I am trying to analyze a seed germination trial comparing 2 different germination treatments. I sowed seeds from 10 individual plants in 10 different petri dishes for each of the 2 treatments, with between 22 and 200 seeds per dish, and recorded germination rates (number of seeds germinated per...
  4. R

    How to check whethere there is a difference between 5 samples means

    I have five samples with their means (60, 58, 61.5, 48 and 42) and standard deviations (1, 3, 1.5, 4 and 2) for 3 trials. How to check whether there is a significant difference between these values by statistically.
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    Comparing Groups 2 sample T-test or Anova

    So I have a word problem that I can't get my head around. Perhaps because the wording of the question is leading me down the wrong path about the variables. Any help would be greatly appreciated. So we have two variables (dissolved oxygen and levels of chemical waste) both quantitative. So...
  6. S

    Required sample size to distinguish means of two binomially distributed rv

    Hello, Currently trying to work out the best way to calculate the number of samples that would be required to get a certain confidence interval. If I have two binomially distributed data sets, which I predict to have some probability of an event p_1 and p_2. If I were to estimate p_1...
  7. E

    Follow-up tests with 2-way within-subject repeated measures ANOVA

    Hi everybody, I've been doing a 2-way within-subject repeated measures ANOVA and I have some questions: 1) Is it correct that I'm only allowed to do follow-up tests if I see an interaction? 2) Is it acceptable to do t-tests as follow-up tests or should I use something else? Best...
  8. 5

    What's the correct correction factor? Multiple one-sample and paired tests...

    This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments. To make it easier to describe clearly, we could consider the experiment as having 3 parameters that could be varied. We could call these A, B...
  9. N

    F-test for two-tailed vs. one-tailed

    Goal: Determine if two sample sets are "Statistically Different" from one another. My dataset is comprised of groundwater laboratory results from a stream, one upstream and one downstream. There are 54 individual parameters that comprise my entire dataset. I will be comparing each parameter...
  10. J

    paired sample t-test vs. repeated measures ANOVA

    I think that the Psychology Research forum is more appropriate so I moved my question there--I could not figure out how to delete this thread. Thank you for having a look!
  11. J

    Overlapping sample: t test with partial pairing??

    Hi - I've a work project that requires a stat test between Product A and Produce B performance ratings (On a scale of 1 to 5 how well did Product A / B perform?) We are treating the data as interval scaled. The samples partially overlap. e.g. Product A has n=500; Product B has n=500...
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    Permanova + T-test

    Hello, I have a question regarding the data analysis listed below. I am trying to run a similar study but I can't truly understand why a PERMANOVA was used. Any help would be greatly appreciated. In my study, I am comparing prey species composition, abundance, pecking rate, and swimming...
  13. R

    Interpreting Independent Sample t-Test results

    Hello folks! I'm having a hard time understanding the output that SPSS gave me regarding my Independent Samples t-Test. Can anyone help me describe this output? I've attached the output for you.
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    Change scores: t-test or mann-whitney U test ?

    Hi there Nice forum btw. Question: I have change-scores on pain in 37 patients pre/post intervention. which test do you use? t-test or mann-whitney U test? i was told that with change-scores they are always normally distributed and i can use a t-test... any reference for such a...
  15. R

    comparing and accounting for temperature difference between two locations

    Hi, I'm a student currently undertaking my dissertation. The aim of my research is to try to gain an understanding of what informs people's temperature perceptions, with a specific focus on cultural theory, although other sociodemographic questions were also asked in the survey. One of the...
  16. H

    Help with the normal distribution using R

    Hi! We are total statistics and R-newbies, and we're having some difficulties with our data that we hope some of you might be able to help us with. The problem is that we don't know how to check if our data is normally distributed/we don't know how to make it look normally distributed...
  17. M

    paired sample t-test for repeated measures in 1 subject

    I am conducting a psychology experiment. In my pilot study I analyze responses of one subject which ran through two conditions. The task is to predict outcomes based on previous outcomes. On every trial the subject tries to predict the outcome as good as possible and learns to adapt the...
  18. S

    Rsearch Design

    Hi, I am currently writing my dissertation. My lecturer told me my research design is repeated measure with multiple groups, however she is currently off on sick leave and have been told other lecturers can not help me. I am questioning her choice (unwisely probably), as I can not seem to...
  19. L

    Z-test? Paired t-test? T-test two sample assuming equal variances?

    Hey guys! I'm hoping this is the correct forum to post this in. I'm working on my senior thesis, and it's been a while since I've taken stats so I'm hoping you guys can help out. I'm looking at firms following an event and finding the return on their stock price in a set time period. I'm...
  20. B

    T-Test Help

    Hi I am totally new to stats and finding it very difficult. I was wondering whether or not anyone could help me understand which T-Test to use to try to see if my results are statistically significant. I'll try to explain the situation. I have 8 sub groups, which make up two main groups (A...