why is a dependent observation a problem in statistics? why is dependent observation a problem why is dependent observation a problem why is dependent observation a problem why is dependence a problem why is dependence a problem why is dependence a problem why is observation dependent data useful why is dependence a problem in statistics? why is dependent observation a problem why is dependency a problem in statistics why is dependence a problem why is dependencies a problem? why is dependence a problem in statistics? why is dependent observation a problem why is dependence a problem in science why is it a problem to collect dependents why are dependent observations a problem? why do we depend on data why is dependent observation a problem