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It should also be mentioned that even if data from multiple grades are available, the respective sample size in the different grades can be very small.
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The redraft was (partly) a consequence of the experience gained though the previous IEA study because countries expressed concerns that sampling students from multiple grades was a troublesome enterprise (Peaker, 1975).
The other three components were not taught across multiple grades or were taught in only one country.
If he is looking at porn multiple hours nightly, however, and his grades are slipping, he seems socially isolated, and his sexual/romantic behaviors and attitudes seem "off" to you, he may have a problem with addiction.
As well, it will add great value if multiple grading systems are used within a single dataset and molecular differences assessed between the different systems.
His grades are better.
His grades are suffering.
Her grades are slipping.
Grades are just numbers.
Grades are extremely important.
However, students' average multiple-choice exam grades were positively correlated with postactivity clicker scores (r = 0.24, df = 1932, p < 0.0001).
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