Kuder-Richardson Formula 21

K - number of items p - proportion of the examinees who got the item right q…

Kuder-Richardson Formula 20

WHERE: K - number of items p - proportion of the examinees who got the item…

Pearson's r Formula for Measures of Correlation

WHERE: X - scores in a test Y - scores in a retest N - number of examinees…

Ballad of A Mother's Heart

Ballad of A Mother's Heart by Jose La Villa Tierra

The night was dark, for the moon was young And the stars were asleep and rare; …

THE SEA