t test

  1. E

    Statistical significance of results

    Hi, I made an experiment and I want to know if the results are significant or not. But I know nothing about statistics. In that experiment, I show a serie of 70 videos to 12 participants. Each participant should select from a list of seven choices (the same for all the videos) the emotion...
  2. F

    Testing help

    Hi all, Not sure if any one can help but here goes. For a recent research i carried out a survey on moths. I picked 2 separate areas, wooded area and a totally different area habitat wise. Area "A" and Area "B" For each area i mapped out 10 unique collecting sites. I then carried out the...
  3. A

    T test problem

    Dear all, Doing a t-test I got this results : 200 400 Mean 944.58333 960 Variance 402.08333 222.727273 Observations 12 12 Pooled Variance 312.4053 Hypothesized Mean...
  4. S

    Whether to use z test or t test

    hi team, I got the following question given below. According to me this should be solved using z test as the sample size is more than 30. But they are using t test. What is the correct method z test or t test? Please advice A social worker wants to know whether the mean annual salary of...
  5. J

    2 Way ANOVA or multiple t tests with correction?

    Hi all, I am trying to do some data analysis, and I'm not sure whether to use a 2 way ANOVA or multiple t tests with Bonferroni correction. I am looking at the effect of a chemical on bacterial binding to different polymers. So for each polymer, I want to know if there is a difference in...
  6. W

    Comparing habitat use across two different locations - mann whitney U?

    Hi, I'm really stuck with what test to use with my data. I have data on habitat use of 6 different habitat types across 2 locations and I'm unsure what test is most suitable. I thought initially mann whitney U but this doesn't seem to be working for me. I've attached the table below so you...
  7. L

    Likert scale data -can I use paired t-test? What about normality testing?

    Hey all! I have read many contradicting manuals and advice, so I decided to ask the best experts –you guys :) I have data from 40 subjects. I asked them to analyze eight short films (four sad ones, four neutral ones). I asked them to rate on a Likert scale 1 (not at all)-5 (very much) how much...
  8. T

    Comparing two groups and then the sub-groups (of the same)

    Hi I have four groups of variables A, B, C and D. The variables A and B also have (natural) sub-groups (say A1, A2, A3 and B1, B2 and B3). I want to compare them as follows: A - B - C - D (using ANOVA for 4 groups) A1 - B1 (using t test for two samples) A2 - B2 (using t test for two samples)...
  9. T

    Reporting t-test (table) + boxplot (mean, range and outliers)

    Hi I am looking for a reasonably appropriate way to report t-test along with a summary statistics. Initially I only wanted to go with box plots, and now I have to add t-test results as well. Is it a good idea to report the t-test in a table with a box plot for summary statistics as below image...
  10. H

    ANOVA maybe?

    I realized the answer but can't see how to delete.
  11. J

    2 sample independent sample t test

    Can someone please explain why you don't square the variance in this problem and do for others??
  12. C

    I failed the 4/5ths Rule. Can I prove it is not significant?

    I am a (hypothetical) employer who used an aptitude test to screen candidates for their trainability before hire. I am being sued for discriminating against Middle Eastern applicants. I have data that shows how many Blacks, whites, Latinos, and Middle Eastern people were hired and not hired...
  13. K

    Order Effects- Conflicting results from two-way ANOVA and split file t tests!

    Hello, Whilst currently working on my dissertation I decided to check for order effects (I had of course used counterbalancing as part of the design). My experiment looked at the effect of motivational prime on categorisation and probabilistic reasoning. There were two groups and both groups...
  14. D

    Comparing a Binomial and Normal Distribution

    So I'm currently analyzing several sets of data, that all represent the exact same type of data. There are multiple sets of this data, but however are in different forms. That is, some of this data is in the binary form, either presence of absence, while others are in the quantitative form. My...
  15. C

    Basic help with stats for drug treatments

    Hi there :wave: So I haven't a clue where to start and am hoping someone on here can point me in the right direction. I'm starting to analyse my data from laboratory research but I don't know which test to use. My data is numerical and follows a normal distribution. I have 2 different...
  16. M

    When do I use chi square and when a t-test? I just don't get the difference...

    Hi there, I'm trying to teach myself statistics from a book but I don't understand when I have to use t test and when chi squares. I tried to look it up on google but I still don't get it! To what I understood, you use BOTH for determining if there's a difference between groups and if this...
  17. J

    Test for differences across tasks according to group

    Hello, Hoping someone can help as I am at a bit of a loss of what inferential statistics to run for my masters work. I have low anxiety and high anxiety participants (20 of each). They complete two memory tasks. In one memory task they have distractors and in anther memory task there are...
  18. M

    Comparing a sub-population to its overall population?

    Hi there, I am collecting data from a population of about 150 or so, and also from a subpopulation within that of 10-15 which are receiving a specific treatment. I am aiming to compare their scores on the same measure, to see if this population receiving treatment is truly 'special' in some...
  19. O

    Confusing Power of T Test!

    Hey all, This is my first post to this site. My question is: I am using this (given) regression to find the relationship between gender and wage: Lnwage = Beta0 + Beta1male + Beta2Professional + Beta3Management + Beta4Educ + u My professor wants me to test the power of the test with...
  20. S

    Permutation Testing to find significant molecules

    Apologies if this is quite a basic question but I'm fairly new to stats. I have a 24 x 70 matrix consisting of rows of 24 human serum samples and columns of protein intensity values for 70 different proteins. The 1st 12 rows are healthy people (type 1), the remaining 12 rows are patients...