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先来看两个案例:案例一《一杯水中能溶解多少食盐》一课,学生通过对一杯水中能溶解多少食盐的探究,获得水中只能溶解一定量的食盐的科学结论。在实验过程中,由于受学生操作、水量、小勺大小等因素的影响,学生记录的实验数据存在比较大的偏差。案例二三年级学生在养蚕和栽种植物的探究过程中,有部分学生因种种原因所养的蚕和植物死亡了。案例一中的数据偏差是否就代表实验参与的有效性出现问题呢?案例二中有部分学生的蚕和植物死亡了,是不是这部分学生就进行了无效的探究呢?
First look at two cases: a case of a cup of water how much salt can be dissolved in a lesson, the students through a glass of water can dissolve how much salt exploration, access to water can only dissolve a certain amount of salt scientific conclusions. During the experiment, due to the influence of students’ operation, the amount of water and the size of the small spoon, the experimental data recorded by the students showed relatively large deviations. Case sophomore students in the sericulture and planting of plants in the exploration process, some students due to various reasons raised silkworms and plants died. Is there any problem with the validity of the experimental participation in the data deviation in case one? In the case two, some of the students’ silkworms and plants died, did not this part of students conduct an invalid inquiry?