hypothesis testing

  1. A

    What is the role of relational databases in research design and hypothesis testing?

    I am taking a database management course with a focus on relational databases as part of the requirements of a degree program. One of the course requirements is to apply relational database techniques to a case study. In other words, students have been asked to identify a hypothesis and research...
  2. J

    Determine if a worker differs from typical performance?

    I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see if a given worker has a lower than average score when it comes to converting first-time jobs into recurring jobs. I do this by taking all...
  3. M

    Interpreting a paired t-test for price means

    Hey everyone, I am new to this, but I would be extremly thankful, if someone could help me with this. I research the topic of rate parity for hotels in Germany, which involves comparing rate means for different distribution channels. I have performed a paired t-test for the "phone rate...
  4. J

    Statistical analysis for Rubric Based Research

    There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each participant will be evaluated using a rubric on scale of Excellent, Good, Fair and Poor. For my research i want to evaluate the following questions...
  5. M

    Hypothesis Testing

    Hello , I have the following Null Hypotheses : There is no value grater than 20 If I have a population : {100,95,95,94,90,90,100,99,99,98,80,20,90,90,80,70 ,70,65,68,87,87,87,96,75,8,95,95,91,} What is the best statistical method to reject this hypotheses ? Thanks in advance...
  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. G

    Need Stats Help! Please!

    Two independant random samples were taken at two neighboring high schools to determine the difference in the proportions of students who had jobs outside of schoo. The sample of 75 North High students indicated that 60% of them had jobs outside of school while the sample of 40 south high school...
  9. 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...
  10. C

    Hypothesis testing nominal data

    Hi all Just found this great website but unfortunately i cannot find a thread that can help me so here is my question. i got an assignment where the question is: "Examine if the market share of EDC is 25 %(real estate agent). If not, please indicate the size of the market share." So from...
  11. S

    univariate test for comparison

    Hi, currently i'm testing a tree-based algorithm based on permutation tests (doesn't really matter for the question) for a paper. For every variable (100 in my simulation) I get a p-value based on the null hypothesis of independence between the variable and the response Y. Now I should...
  12. A

    How to test for differences in annual changes?

    am working on insurance data. My goal is to test the effectiveness of a campaign. I need to test the hypothesis whether the "year on year percentage change of my test group's agents' income" is significantly different from from "year on year percentage change of my control group's agents'...
  13. M

    McNemar test valid when one discordant pair is zero?

    Hi all, Wonder if anyone might help: if I have two binary variables (say, A1 and A2), and A2 has all of the "successes" of A1 (row-wise) but also some extra successes - what would be the appropriate statistical test to see whether the "extra successes" in A2 are statistically different from...
  14. T

    Power curve of distribution with 2 parameters

    Hello. I want to obtain a power curve for goodness of fit test of a distribution with 2 parameters, let say A & B. My test is actually about parameter B. And say mean=A*B. So, I'm curious of how should i generated the sample to get the power? Should i generate samples with all the same mean...
  15. P

    One-tail test for research

    Hello, I am new to research metholologies and statistical testing. Currently, I am involved in the data analysis section of research. My instructor wants me to discuss the application of a one-tail test to my research. I am studying the effect of technology training on teachers' computer...
  16. R

    Hypothesis testing: P-value method

    A survey claims that 9 out of 10 doctors recommend Aspirin for their patients who have children. To test this claim against an alternative that the actual proportion of doctors who would do this is less than the claimed, a random sample of 100 doctors was considered. In this sample 83 doctors...
  17. B

    Hypothesis Testing Homework

    Please help, I don't know where to start with this question. A large manufacturing company found that in the past 32% of all supply shipments were received late. A new system was recently implemented. A random sample of 118 deliveries since the system was installed revealed that 22 deliveries...
  18. H

    Hypothesis testing for comparing single channels of states in multivariate HMM

    In brief: I have a multivariate observational output with low covariances, each dimension of which can be considered the result of a distinct hidden state sequence, with near-independence from other dimensions' hidden state sequences but such that independent analysis of each dimension of the...
  19. J

    Likelihood Ratio Test

    Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters are accurate. For example... We have a machine that is producing cogs with mean diameter 12 and standard deviation 1. Ho is that mean and variation...