one tailed

  1. H

    Stats help - please!

    Hi all, I am writing a project proposal: randomized, placebo-controlled crossover trial, I will be investigating treatment vs air. Participants will be asked to inhale the treatment or high-flow air (placebo). In this case, would a one-tailed test or a two-tailed test be more appropriate...
  2. T

    One or two tailed test?

    Hi, I am currently struggling to decide whether the following problem requires a one or two tailed t test for a hypothesis test. I have uploaded a photo of the data used if needed. 'Test the individual significance of the explanatory variable. You should decide on an appropriate t-test (one...
  3. T

    What SPSS action to take?

    Hi, I have a set of data that I need to use SPSS for. I am not sure what tests I need to use to prove their is a significant difference between the two sets of data. The data I am looking at is Group 1 and Group 2 and the frequency to which they ran within a 6 week period. Group 1...
  4. C

    help? hypothesis test selection and execution

    Hi. I am trying to figure this out and I'm not sure if I am doing it right. a) did I select the correct type of hypothesis testing??? b) am I using the numbers in the right place (I have SD for 3.5 for pop and 2.86 for sample. which one is right for my hypothesis and equation?) c) what else am...