【简答题】计算题 测定某试样中氮的质量分数时,六次平行测定的结果分别是20.40%、20.52%、20.54%、20.58%、20.50%和20.56%。(1)计算该组数据的平均值、极差、平均偏差、相对平均偏差、标准偏差和变异系数;(2)若此样品为标准样品,其中氮的含量为20.46%,计算以上测定结果的绝对误差和相对误差。
【单选题】测量工具能否稳定地测量所测的事物或变量叫做测量的
【简答题】A.Study a weather map. B.Visit a weather station. C.Listen to a weather report. D.Go to a storm shelter.
【单选题】-- How do you study a test? -- I study listening to tapes.
【单选题】—How do you study a test? —I study working a group.
【单选题】A research scientist wants to study a certain attribute of dogs. It is estimated that approximately 5 percent of all dogs have this attribute. If the scientist wants to study a sample of N dogs having...
【单选题】测量工具能否稳定地测量所测量的事物或变量叫做测量的( )
【简答题】A.Study a weather map. B.Visit a weather station. C.Watch a weather report. D.Go to a storm shelter.
【简答题】测定某试样中氮的质量分数时,六次平行测定的结果分别是20.40%、20.52%、20.54%、20.58%、20.50%和20.56%。(1)计算该组数据的平均值、极差、平均偏差、相对平均偏差、标准偏差和变异系数;(2)若此样品为标准样品,其中氮的含量为20.46%,计算以上测定结果的绝对误差和相对误差。