hypotheis test

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    R and Stats: Multiple t-testing

    So 60 labs decided to group up to test the null hypothesis (sample mean is equal to zero) against the alternative (sample mean is not). The 60 labs collect 10 samples each and all use an α = 0.05 level. Assuming the null hypothesis is true: a) Probability that no labs reject the null? b)...
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    Hypothosis Testing Help

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    volatility analysis

    Hello everyone, I want to write my thesis about the stability of stablecoins and need some help with my analysis. I want to analyse the volatility of stablecoins compared to the USD and Bitcoin. My Null Hypothesis would be something llike "The fx-rates of stablecoins to 1. USD and 2. BTC are...
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    Bonferoni test

    In my example, I have about 50 statistical analysis, so is it feasible to use bonferoni test in this case?. 05/50 will be very very small value and it will be impossible for one type of algorithm to significantly outperform the other. Thanks
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    which hypothesis test to use

    I have the mouse growth data as shown below. There are two cages. Cage-1 has 'type-A' mouse and Cage-2 has 'Type-B' mouse. Each cage has 4 mouses. Every week each mouse weight and total food consumption per cage are recorded. I want to do the hypothesis testing and find which type of mouse...
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    Matt Whiteny U test Vs T test

    Hello fellow statisticians, Problem definition: I need to test whether the difference between the "mean" utilization metrics of two machines is statistically significant. Given Data: Utilisation data is available for two machines for more than 100 days. Therefore, the mean, standard...
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    Confusion between z and t values

    Hi, Alright so I have some confusion on when to use specific tests and the z vs t test. Given this example (not my homework) could someone please clarify. Alright say you have a random sample of size 200. You find the sample mean to be 10 and the sample standard deviation to be 5. What...
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    Test Statistics

    A major swimming chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is evidence that more than 5000 of the 20000 households in the area have swimming pools. It conducts a telephone poll of 300 randomly selected...
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    multilevel analysis

    Dear folks, I have nested data within schoolclasses, therefore I want to run multilevel analysis' with R, package lme4. My hypothesis is H0: x = 0. I don't know how do put this into a multilevel analysis. Can you help me with this? Kind regards
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    ANOVA exercise

    Hello, My question is: in which way this exercise should be solved? It can't be solved with F test, because there were no given F-test value table on the exam, so it has to be another way to solve it. The only thing I can formulate are hypotheis: H0: μ1 = μ2 = μ3 H1: at least one mean is...
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    Finding the z score for a hypothesis test

    Help! I'm working on a project that is due at the end of the week and I can't figure out the z score for this hypothesis test. According to the US Census, 38% of college students are over the age of 25. Out of the 60 students randomly surveyed, 20 said that they were over the age of 25, so...
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    Hypothesis Testing

    Can someone please explain this? How did that conclusion arrive? P(Type I error) = P(reject H0 | H0 is true) = P(X1 ≤ c, X2 ≤ c | N = 16) = cC2 / 16C2 = c(c-1)/240 What if it was P(Type I error) = P(reject H0 | H0 is true) = P((X1+X2)/2 ≤ c | N = 16) would the equation be different?
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    Help! Which test do I use and how?! *very rusty graduate*

    Hi all I have been given some data and I need to do some significance testing on it. The data revolves around food types. Firstly I have been given data, about 1000 rows, of a food type with the date the food was bought and date it went off, I need to test whether after X number of days, a...
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    Chi-square or test of equal proportions?

    Hello First post on the forum. I'm currently studying for my ordinary certificate from the Royal Statistical Society and using the textbook "Introducing Statistics" by Upton and Cook. Dispite pouring over the textbook I'm still confused as to which test to use for the following situation...