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    Multiple Regression

    When we fit a multiple linear regression, how i can know which explanatory variables i should include and which ones i should exclude from the model, how i know the ones that could affect the model negatively? Thanks in advance
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    Testing the effect of gender on walking capacity using linear simple regression?

    Hello, when i test the effect of gender on walking capacity using linear simple regression, i treated gender as categorical variable and change it from 0,1 to male, female. However the output i got is like that: Coefficients...
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    Guessing P value

    I have a sample of 200 their body weight is normally distributed with mean 67kg and sd 20kg 95%CI (64.23, 69.77). the hypothesis is about whether mean is different between males and females, the statistical test i used to test this hypothesis is two-sample t-test. i also have the 95%CI of the...