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In 1977, Terry Fox, a young Canadian athlete, was 1. ________ with cancer at the age of 18. As a result, his leg had to be amputated, and he was fitted with an artificial one. However, instead of becoming 2. ___________ he maintained a(n) 3. _________ attitude and became mentally stronger. Terry experienced first-hand the 4. _________ of cancer patients. He longed to help them in any way he could. Soon, he devised a plan to 5. _______the entire length of Canada on foot in what he called the “Marathon of Hope”. This plan had two purposes.

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Luz broke his own record, and 1.me to deliver a peak 2.. The 3.I landed from my final jump—the one that set the Olympic record of 8.06 metres—he was at my side, 4.me. Despite the fact that Hitler 5. at us from the stands not a hundred metres away, Luz shook my hand hard.

某品牌袋装糖果每袋重量的标准是500±5克。为了检验该产品的重量是否符合标准,现在从某日生产的这种糖果中随机抽查10袋,测得平均每袋重量为498克。下列说法错误的是( )

A. 样本量为10
B. 抽样误差是2
C. 样本平均每袋重量是估计量
D. 498为估计值

下列说法中不正确的是( )

A. 样本均值是总体均值的无偏估计量
B. 样本比例是总体比例的无偏估计量
C. 样本标准差是总体标准差的无偏估计量
D. 样本中位数是总体均值的无偏估计量

下列关于估计量说法正确的是 ( )

A. 矩估计量都是无偏估计量
B. 一致估计量都是无偏估计量
C. 要估计总体均值,样本中位数比样本均值更有效
D. 两个无偏估计量中,方差最小者为有效估计量

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