Question: Please help 2.144 Exercise and mortality. A sign in a fitness center says, Mortality is halved for men over 65 who walk at least 2
Please help

2.144 Exercise and mortality. 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 exercise causes lower mortality
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