题目

考查小麦种子经灭菌与否跟发生黑穗病的关系，经试验观察，得到数据如下表所示： 种子灭菌种子未灭菌合计黑穗病26184210无黑穗病50200250合计76384460 试按照原实验目的作统计分析判断小麦种子灭菌与黑穗病是否具有相关关系． 答案：【答案】有95%的把握认为小麦种子灭菌与是否跟发生黑穗病有关．【解析】先计算出，根据独立性检验可得出结论.，∴有95%的把握认为小麦种子灭菌与是否跟发生黑穗病有关．I work very hard because I don't want to            . [     ]A.let my parents down B.let down them C.let my parents to be disappointed D.let my parents go.