# test of significance

1. ### Z test: can I use it in this context ?

Hello all. Nice to meet you. I would like to consult you regarding a problem I'm facing: Imagin you have a dataset containing all of the operating workplaces in a certain city (say, 500 in number). The dataset contains the workplace name, average salary and percentage of workers by race and...
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### How can I determine if two graphs are statistically significantly different

Hi, I'm working on a medical research project and need some stats help. I have limited statistical knowledge but I understand that basics. I need help with the following... I have two graphs: A: y = -0.000003x^3 + 0.000664x^2 - 0.028609x + 0.333098 B: y = -0.000003x^3 + 0.000781x^2 -...
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### How to test if gender impacts mortality rates when already considering age

Hi, I am currently working on a research project where I'm analysing the impact of different factors on mortality. I have the past 10 years of data from a specific hospital and I have graphed the mortality curve by age separately for males and females. I can see that the one curve lies above...
4. ### S-shapec urve goodness of fit

hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2 types of answers: 1. test to prove that the data is from normal distribution. it is true that the cumulative curve of a normal distribution is...
5. ### Assess statistical significance of two PPVs

Assess significance of the difference between two PPVs I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as probable, possible, or unlikely case, depending on how likely we believed the diagnosis to...
6. ### What Test to Use to Compare Groups

I'm looking through some data that I have collected from my patients over the past year and wanted to know what Statistical Test to use to see if a certain drug I have been giving my patients (different patients received different doses based on pain relief) affected how long it took their heart...