请结合材料回答下列问题:
(1)上述图表中的数据说明了什么问题?
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(2)假如让你参与调查,你还会采用哪些调查方法?(至少两种)
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(3)针对图表中反映的问题,结合教材知识,请你提出改进意见。(至少两条)
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