निम्नलिखित में से किस मापन पैमाने (measurement scale) में 'शून्य' का अर्थ मापी जा रही वस्तु/राय की पूर्ण अनुपस्थिति होता है?

Which of the following accurately describes the systematic division and categorization of components within the standard structure of a research report?

In experimental research design, the extent to which observed results are directly attributable to the experimental treatment rather than extraneous variables is called: