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Help: Causation hw Problem??

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yodaguy7's picture
Joined: May 2008
Help: Causation hw Problem??


We're doing establishing causation in ap stats right now, and I got a homework problem I have no idea how to do. It reads:

A sign in a fitness center says, "Mortality is halved for men over 65 who walk at least 2 miles a day."
a) Mortality is eventually 100% for everyone. What do you
think "mortality is halved" means?
b) Assuming that the claim is true, explain why this fact does not show
that excercise causes lower mortality.

This comes from the textbook, The Practice of Statistics, third edition, in case any of you have have it. It's problem 3 on the "case closed" for chapter 4, on page 314.

Thanks a lot

Ferris Bueller's picture
Joined: Mar 2008

a) not sure how to say it

b) it does not say that mortality is halved because they walk at least 2 times a day. it could be that the people who walk at least two times a day are just in better health, or have lived healthier lives.

all in all, it's just another brick in the wall...

I took: AP US Hist, AP Stats, AP Chem
I am taking: AP Calc, AP English, AP Phsics

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