how are pupils measured and compared to other schools are pupils independent and equally distributed which test is used to assess school effectiveness when are pupils independent and identically distributed why are school tests necessary how is the school effect measured are pupils in the classroom independent is pupils in a school independent and identically distributed? are pupils in a school uniformly distributed? why do we use z-tests? why are pupils' test results compared to national results are test scores in a school independent are pupils in a school independent and identically distributed when compared to a national population? what is central limit theory is student test scores uniform are pupils independent and uniformly distributed are pupils in a school independent and identically distributed which theorem is based on a central limit theorem? are pupils in school identically distributed are pupils in a school independent is test results independent and identical