2018 AP Statistics Free Response Question 4

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Let's test if a new procedure will help the patients with ACL.
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2018 AP Statistics Free Response Question (FRQ) 4: Answer/Solution
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the problem doesnt state if the people involved in the sample had their acl completely torn. so u cant conclude without that specification

dhruvanaidu
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"causal" relationships are a big deal
large sample sizes often give statistically significant results...was it double blinded??..more tests are needed?

johncox