Hi there, I don't understand the Solution for E11.8.H0: muB-muA >=0 ok! alternativ should be thenH1: muB-muA <0 The solution's t.test Syntax is:dep.t.test <- t.test(weight$before, weight$after, paired = TRUE, alternative = "g") shouldn't it be: dep.t.test <- t.test(weight$before, weight$after, paired = TRUE, alternative = "less") Thanks for the Help.GreetsAlex

Hi Alex, thanks for the question and apologies for the delay in response -- unfortunately, this got lost in the threads somehow. Not quite. But I do see now that the way I've stated the H0 might be a little confusing -- I am editing the file now. Anyhow, so... The code in the solution is going off of this formulation of the hypotheses: H0: muB - muA <= 0 OR D0 <= 0 (as defined here, the D is a negative number; or in the After condition people are either keeping their weight or increasing it) H1: muB - muA > 0 OR D1 > 0 (as defined here, the D is a positive number) So, in our code, we'd set the alternative argument in the code to "g" or the true difference in means is "more than zero"! dep.t.test <- t.test(magn$Before, magn$After, paired=TRUE, alternative = "g") Hopefully, this is helpful. Thank you for the question! Best wishes, Simona365 Team

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Alexander Hennrich

Last answered:

22 Apr 2020

Posted on:

06 Apr 2020

R T Test Weightloss example E11.8

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Simona Dobreva

Posted on:

22 Apr 2020

R T Test Weightloss example E11.8

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