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 Apr 2, 2020
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10 of the 30 surveyed say 'theme park'    so you would expect 1/3 of total would feel that way    1/3 * 225 =.......

 

Anything that selects a certain group or a smaller group would make it less accurate

    so   grade 7    or cafeteria would likely make it less accurate  BUT it is hard to say given the info in the Q.....if the 225 students are mostly from level 7  or is all of the students are in the cafeteria, this would not be true.    But the other two choices> asking more peole or more randomization would likely make it more accurate.

 Apr 2, 2020

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