HELP WITH STATS - Good sampling methods for this would be what?

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URGENT HELP WITH STATS - Good sampling methods for this would be what?

Number1-1.png


Are the ones I selected right?
I only get one submission.
Please please help!
 
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Also, can you check number 2 for me as well?

Number2.png
 

Thread 'Deductive proof in logic formal systems'

I was reading documentation about the soundness and completeness of logic formal systems. Consider the following $$\vdash_S \phi$$ where ##S## is the proof-system making part the formal system and ##\phi## is a wff (well formed formula) of the formal language. Note the blank on left of the turnstile symbol ##\vdash_S##, as far as I can tell it actually represents the empty set. So what does it mean ? I guess it actually means ##\phi## is a theorem of the formal system, i.e. there is a...
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