_:vb50935052 . "study protocol" . _:vb50935053 ":arcc045b496" . _:vb50935053 . _:vb50935052 . . _:vb50935053 . . _:vb50935052 _:vb50935053 . "study design"@en . _:vb50935053 . "A study design is a protocol for the proper execution of a study which normally requires a carefullly crafted research question or hypothesis and at least one variable under observation and observed values for that variable."@en . "SIO_001041" . . _:vb50935052 . _:vb50935053 . _:vb50935052 ":arcc045b495" . _:vb50935052 . .