null hypothesis

  1. A

    Multivariate Normality accepted at 5% significance level but rejected at 1% ??

    Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's test for this and below is the summary of the results : Mardia Skewness 58.29 <.0001 Mardia Kurtosis 2.43 0.0149 Henze-Zirkler T 7.52 <.0001...
  2. K

    Help for a nonparametric test

    Hi, I have a set of data which is consisted of ages of 5 players and their scores in game. The question is this: Does the older players tend to get higher score? Which nonparametric test should I use? and How should I proceed? Thanks
  3. F

    p value interpretation in Mann-Kendall test

    Hi, I am performing a Mann-Kendall test on a set of a data. and I got a p value of 0.15 so it means the null hypothesis of NO TREND is not rejected. Does it mean that it it accepted and there is no trend in my data or it should be 0.95 to say that there is no trend in my data? how this p value...
  4. T

    Critical Value (T-Statistic Question)

    Hey everyone, I have gathered some data for a school project and I am calculating the various ways to express the data. I have come to the point where I should represent the t-statistics, but I am having some trouble with the critical value portion. I have already done the one sample t-test...
  5. S

    Please Help - How Do I Prove Hypothesis?

    Hi, I am in 6th grade, trying to do an analysis of data for a science fair project. Sorry, but I am only at Algebra 1, I do not have any background in statistics. I have been reading and trying to understand what test(s) to use, but with no luck. My experiment is can a blindfolded...
  6. P

    QUIZ HELP: Null and Alternate Hypothesis, P-value, critical value and test statistic

    My quiz is due tomorrow and 10% of my grade. I need help doing it because I'm pretty sure I have no idea what I'm doing. The first question is A researcher claims that the average age of a woman before she has her first child is greater than the 1990 mean age of 26.2 years, on the basis...
  7. D

    Appropriate null hypothesis for a two-stage regression

    Hi – thanks everyone for your help in advance. I’m working on a two-stage regression, in which a coefficient from the first regression is used as an independent variable for the second regression. Both regressions turn out significant, but I have no idea what that proves, since the hypothesis...
  8. M

    95% confidence intervals and null hypothesis

    if a 95% confidence interval for a sample mean is (-1.23; 2.68). what would be tthe inferential decision made from a null hypothesis test when (i) Ho: mean(mu) + 2.0, and (ii) Ho: mean(mu) = -1.0 ? support each inference with a brief explanation for why you would make that decision. and...
  9. J

    I need help with Null Hypothesis type 1 and 2 errors

    Explain which type of error, type 1 or type 2, could be made in each of the following cases. Just pick A, B C or D. For example for (I) Pick one of the four options (A B C or D). For (II) Pick one of the four options (A B C or D) for (III) Pick one of the four options (A B C or D), for (IV) Pick...
  10. J

    Null hypothesis

    4. http://i42.tinypic.com/2woyqgz.png 10. A physician claims that as soon as his patients have a positive pregnancy test, he is generally able to predict the sex of the baby and that his probability of being right is greater than the one-half that would be expected if he were just guessing. A...
  11. H

    null and alternate hypothesis

    I'm getting confused over this. Lets say a man is debating whether he should buy a car or not. he is basing his decision on whether other people are buying cars too. if the percentage of other people buying cars is 15% or more he will buy a car but if it is less than 15% he will not. is the...
  12. A

    Correctly rejecting a null hypothesis

    Hi all, came here for a bit of advice. Got a bit confused - I think its a fairly simple question. Goal I want to determine whether Sb (Antimony) accumulation is greater in one central area relative to two nearby suburban areas (pre-existing policy implies that is the case). H0: Sb...
  13. N

    Hypothesis testing help

    Hi, I have to: Identify the null hypothesis, Ho, the alternative hypothesis H1 and either identify the sampling distribution (normal, t, chi-square) of the test statistic, or state the methods should not be used and why for the following: Claim: The population mean is 425. Sample...
  14. S

    Compare two variables : Ho = difference is 0

    Hello, This might be very trivial so please bear with me. A = [a1 a2 a3 a4] B = [b1 b2 b3 b4] Ho = [A-B]^2 = 0 i.e. A and B are the same. AND I also want to correct for False Discovery Rate (multiple comparisons) & report values (eg. [a3-b3]^2) that are significantly larger than 0...
  15. spunky

    On the history of MANOVA's null hypothesis...

    hey everyone! this is kind of a different topic from the "how-to-analyze-my-data" questions, but i think it's kind of relevant. anyways, so my advisor brought in this question in our previous research meeting. it seems like people phrase MANOVA's null hypothesis in two ways: 1. the vector...