hypotheses testing

  1. J

    Why does the “linear regression t-test” return a p-value (two-tailed) from regression that is twice the p-value from ANOVA? (Binary predictor)

    I'm using the "linear regression t-test" guide at https://stattrek.com/regression/slope-test.aspx The guide shows calculating t =b1/SE, where b1 and SE are provided by the regression function (here lm() - using R.) The guide shows the p-value gets doubled as this is a two-sided test...
  2. F

    Constructing intervals VS hypothesis testing?

    Hi folks, let me briefly anticipate that I am a total newby to the magical world of statistics. So, right now I'm preparing for a "quantitative methods for economics" test, but while doing my exercises I found myself wondering about what could be very stupid things. here's the thing: I had...
  3. M

    Hypothesis Test for Unequal Variance When Populations are not Normally Distributed

    Hello, I have a situation where I would like to test the hypothesis that the variance of population one is great than the variance of population two. The two samples taken are known to come from populations that are not normally distributed. Also, there doesn't appear to be any symmetry in...
  4. rogojel

    Bootstrap and hypothesis test

    Hi, I have to decide whether two groups have the same variance or not. My sample size is less then impressive, 13 data points per group. I ran Bartletts test and got a p-value of 0.09 - but I suspected that the relatively high value might be due to the small sample size. So, I ran a...
  5. stacy

    spss independence tests

    hi, i have 3 qualitative latent variables, each of these variables is composed of 4 sub variables two of the latent variables are independent one is dependent i want to test the impact of the IV on the DV and to test the link between both two IVs and whether this link has an impact on the...
  6. A

    Correlation (Relationship) study survey - SPSS - Tests to be conducted?

    Hi I have collected data (n=84) for a study on the impact of non-financial reward satisfaction on employee's intention to stay in the organisation. My survey [Attached the copy of my survey] consists of 1-5 Likert Scale [V.Satisifed to V.Dissatisfied] ; Yes,maybe,no ; Importance...
  7. C

    Defining Contrast Matrix

    In the book Applied Longitudinal Analysis, 2nd Edition there is an example in the chapter "Marginal Models: Generalized Estimating Equations (GEE)" in "Muscatine Coronary Risk Factor Study" sub-section. I am illustrating it below : Let Y_{ij}=1if the i^{\text{th}} child is classified as obese...
  8. M

    what does rejecting the hypothesis mean

    Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to understand In research papers the hypotheses are mostly in a particular direction. Like "satisfaction is positively related to customer retention" If...
  9. G

    Help with Sequential Sampling where H0 is that both samples are same distribution

    Hi, I wonder if anyone could advise? My aim is to compare the results of two randomized algorithms to prove that one does better than the other. Normally you'd use a hypothesis test like the Mann Whitney U or T Test. These tests have a null hypothesis that both sets of results are from the...
  10. S

    Testing Hypotheses about Means and Proportion

    Hello Everyone! I am having trouble with one of my questions it goes: It is claimed that fewer than 30% of Thunder Bay households have home delivery of the newspaper. To test this claim, a random sample of 390 Thunder Bay households reveals that only 95 get the paper delivered. Using an...