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re: "Half the schools are below average" - not always true
Posted on 9/30/14 at 10:45 am to SpidermanTUba
Posted on 9/30/14 at 10:45 am to SpidermanTUba
quote:
NOT GENERALLY TRUE
This only happens if the underlying distribution of scores is normal.
Look up the binomial approximation towards normal and get back to us....
1
Posted on 9/30/14 at 10:52 am to CptBengal
quote:
Look up the binomial approximation towards normal and get back to us....
The test scores of students within a school are NOT INDEPENDENT variables. OBVIOUSLY. They have the same teachers, the same learning conditions, the same fellow students to study with (or not). You are populating your samples based on which school a student attends - NOT RANDOM.
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