. The sum scores xi for topic i have sample necessarily mean x¯ and sample variance sx2, in which sample necessarily mean and variance are calculated above subjects. Each and every exam item has response yij, with i indexing topic and j indexing merchandise, and where y¯j may be the https://jeffreyuvwvu.ampedpages.com/the-basic-principles-of-kuder-richardson-formula-20-54123132