Percentage study
In this chart are plotted the scores of 276 pupils in Grades 5 to 8 of a grammar school. ... The pupils of the 6th grade, for example, according to this plan, might range in age from a little over 9 years to nearly 16 ... If the slanting-line method is used, the dots plotted in the Interpretation Chart must be identified, or else it will beanbsp;...
| Title | : | Percentage study |
| Author | : | Marguerite Wilker |
| Publisher | : | - 1927 |
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