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To collect data about the amont of time spent​
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To collect data about the amont of time spent​

To collect data about the amont of time spent​-example-1
User Clsung
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9 votes
A or survey 20 randomly selected students from each grade.
User Smartie
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5 votes

Answer:

Probably the first one because the other two questions would be un-reliable

Explanation:

User Arthur Zhang
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