hypothesis testing

  1. J

    Thesis Help Request - Hypothesis Testing

    Hi I am doing an event study and my null hypothesis is CAAR=0 and alternative is CAAR does not equal 0 (2 tailed t-test). CAAR is cumulative average abnormal returns. Can a two tailed test be used to give directional conclusions, e.g. if the CAAR value is 1.5% and is statistically significant at...
  2. D

    conditional probability of type 1 error - hypothesis testing common malpractices

    If you want to test Ho = 0 versus H1≠ 1,with significance level alpha, but instead of testing this directly, you have a strategy: -> X1,...,Xn is a random sample from a N(µ,σ2) distribution with σ2 known (I shall denote the mean of X as X(m)) and we obtain Z = X(m)/(σ/√n) If Z > 0, let H1 : µ >...
  3. M

    T Test word problem! HELP

    im going crazy trying to figure out this problem; please help! 2. Assume that we drew a random sample of 300 women who had recently graduated from USC. All of these women worked full time in 2018. They earned an average salary of $42,167 (s.d. = $26,413). Based on data from the US Census...
  4. M

    How to Test for Co-integration with the Augmented Dickey-Fuller Test?

    Hi everyone. The table above contains two example factories that I would like to test for cointegration using the augmented dickey-fuller test. I intentionally use this short time series because I want to do the calculations by hand. Below you will see my attempt to carry out this procedure and...
  5. E

    Multiple testing correction - What constitutes a test?

    Hello! I am not how to tackle my experimental setup in terms of multiple testing correction: I have three performance measures (m1,m2,m3) that I collected from 20 individuals. On top of that I have two measures of some anatomical feature. I correlated every anatomical feature with all the...
  6. S

    A Hypothesis testing problem

    I have been facing some doubts regarding the problem given below. Firstly, if this problem is a Z-test or a T-test? Secondly, what should be the standard deviation ? sigma =? Here is my attempted solution, Please help.
  7. P

    Calculating ensemble value for data with non-gaussian errors

    I have 10 data points each of which have non-symmetric (i.e., non-Gaussian) errors. That is, if 'a' is the central value (representing the median), then a^{+b}_{-c} means that 'b' is the positive 1-sigma error and 'c' is the negative 1-sigma error. I want to be able to get a representative value...
  8. J

    Can someone please confirm if I have selected the right tests for hypothesis testing?

    Hi, this is my first post here, hope that I'm doing this correctly! I'm taking a statistics course for my master's where we need to do some hypothesis testing with a pre-defined data set using R. I am unsure about what the most appropriate statistical test to use is, so I was wondering if...
  9. T

    Best scenario: unpaired or paired situation?

    I have a few questions, but first let me give you some necessary background of the experiment and the underlying questions. Basically, the design is as follows: 3 independent repeated experiments across different days using different stocks of a cell lineage (clones); One factor called...
  10. A

    Chi Square or T Tests for Likert Scale Type Survey

    So I have a 4 point likert-type scale with approximately 20 questions. I have categorized each item to be either agree or disagree. I mainly did this because the previous person who used this scale did this. However, that person only displayed frequency data for it and did not run any tests for...
  11. T

    Hypotheses testing - Interpreting r=" . "

    Hello, I'm interpreting data at the moment from my Pearson Correlation analysis for different groups of respondents. One of my group only consists out of two respondents. As a result for the one Pearson correlation analysis I get p=-1 and for the other p=1 as well as both times (Sig 2tailed)...
  12. H

    Hypothesis testing and minitab

    Hi New to the site - I've managed 11 out of 13 questions for my final set of Master Black Belt homework but now stuck! Can anyone offer an explanation to this question and how it could be answered in minitab? I've had a very extensive look online and found multiple solutions but cannot work...
  13. H

    We did an experiment and don't know how to start/proceed with statistics?

    We had to do an experiment in my research methods class. Me and my group did an experiment where we tested if participants remembered words better with or without pictures that match the words. So now we have two sets of data: One set with the number of words they remembered and one set with the...
  14. S

    Two Tailed Hypothesis Testing

    A sales compnay wants to forecast its sales . There are 2 samples with n1 =30 and n2=30 .Since its a small sample I did paired t- Test in excel . I got critical T value is greater than the calculated t value. Im ok till this part. Now in order for the sales company to break even, the average...
  15. N

    Statistical analysis - Work Delay - Some tests relations

    Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time (minutes) to get to work (could be empty) - Nocturnal: 0 (work by day) 1 (work by night) we want to know the relation between delay and nocturnal. So...
  16. A

    Statistical inference.

    Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they two options for inference? or estimation of the parameters comes first and then we apply the hypothesis testing? 2. How can I determine what is...
  17. A

    Goodness of fit tests

    Hi there, Adding to my previous questions: 1. Why do I need goodness of fit test? I mean when I get a set of data should I always suggest a distribution for it and then do test the goodness of fit for this hypothesis? or it comes in sequence of :1.estimation 2.goodness of fit 3.hypothesis...
  18. A

    Statistical inference

    Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they two options for inference? or estimation of the parameters comes first and then we apply the hypothesis testing? 2. How can I determine what is...
  19. N

    HLM Multilevel Modeling - Deviance Statistic Disappeared with MI

    Hi Everyone, I am using HLM 7 for multilevel modeling. I recently started using the Multiple Imputation function in the program, which pools data from 10 datasets that you upload directly into the program. The models run but I can't get the program to give me deviance statistics for model...
  20. R

    Comparison of one outcome to all the other outcomes

    Here is some data to play with set.seed(1e4) color = factor(c(rep("blue",20), rep("red",20), rep("yellow",150)), levels=c("red","blue","yellow")) x1 = rnorm(20+20+150,12,3) x2 = c(rnorm(20,5), rnorm(20,5), rnorm(150,7)) x3 = c(rnorm(20,7), rnorm(20,5)...