hypotheisis testing

Hello, I think of Fisher's approach like this: We choose a test statistic whose distribution is calculated under H0. H0 being a simple hypothesis of preference We break down the distribution according to significance thresholds The significance thresholds are defined by what we consider to...

Hi guys! I have a statistics question that I am completely stumped with: From a sample of people (n=36), with certain eating habits, a mean cholesterol value of 4.1 mmol/l was calculated. From a medical reference table, it is shown that 95% of all values are between 3.2 – 6.2 mmol/l for the...

I have 10 years monthly returns. I calculated annualized return multiplying the mean return over the period for 12. Then I calculated the excess returns as difference between the annualized mean return and the benchmark annualized mean return (no risk correction). Annualized standard deviations...

Hello, please give me instructions with testing the hypotheses: H1: No relationship between predicted and collected data for model 1. H2: No relationship between predicted and collected data for model 2. H1 is tested using predicted model 1 data (pm1) and collected data (cd). H2 is tested...

Hi all I hope all is great with everyone. I'm new on here so sorry to get straight down to my query and hope that someone might be able to point me in the right direction. Thank you. So: I have a prospects direct mail file and I'm testing a new message, (One change). To ensure it’s the...

I have a question regarding hypothesis testing when the samples are not independent. The formula I know for the test statistic for a paired samples t test is where you divide the mean difference by the standard error. I've come across another formula that instead subtracts the mean 'after'...

Hi all, I really really need some help.. For my thesis, I examine the following research question and hypothesis: RQ: Has the use of Twitter been successful in creating public engagement in the Iran nuclear deal? H1: Multimedia tweets are more likely to create public engagement in...

Hi In my study I have hypothesized the following: Top Management Support is a critical success factor on I.T. projects. Adequate Resourcing is a critical success factor on I.T. projects. Having a skilled team is a critical success factor on I.T. projects. Next I have asked these...

Let Y_{ij}=1 if the i^{\text{th}} child is classified as obese at the j^{\text{th}} occasion, and Y_{ij}=0 otherwise. The marginal probability of obesity at each occasion follows the logistic model log\frac{\Pr(Y_{ij}=1)}{\Pr(Y_{ij}=0)}=...

Let U0 denotes intercept variance and U1 denotes slope variance. Given that the coverage rate for the intercept variance is 91% (U0) , and the coverage rate for the slope variance is 91.2% (U1) . Also nominal coverage rate is 95%. Then it is written that I have not understood from the...

Hi, I am runnings some Ttests, and when I conduct a one-tailed test to see if Variable "a" is greater than Variable "b" the result says to reject the null hypothesis, but when I conduct a two-tailed test to see if Variable "a" is different than variable "b" the result says not to reject the...

Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5 (1=Strongly Agree to 5=Strongly Disagree) to survey employees in medical practices on leadership behaviors during a major transition. The goal was...

I am doing computer simulation of a certain random process. During the simultaion I have eight counters arranged symmetrically on a circle. I suspect that counters 1,3,5,7 count significantly less than counters 2,4,6,8. For instance in one such simulation I got counts 2083149, 2082863...