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(Studenmund,练习17.11)”华尔街日报”(1987年7月6日)调查要求35位经济预测员预测1988年6月的三个月国库券利率。这35个预测的(样本)平均值为6.19,一个(样本)方差为0.47。

一个假设这些是随机样本,给出所有经济预测者的平均预测值的95%置信区间另外,解释为什么每个以下解释是或不正确的。:

湾1988年6月实际国库券利率将在这个时间间隔内有95%的可能性。

所有经济预测员的预测中约有95%属于这一时期。

(Studenmund,练习17.12)耳垂测试是在一封给着名的新英格兰医学杂志的信件中介的其他中国桑德斯·弗兰克博士(Sanders Frank)博士报告说,他的耳垂皱纹的男性患者中有20例如,其明显耳垂皱纹的患者的平均胆固醇水平为257(mg / 100ml),平均为215,健康中年男性的标准偏差为10。

一个。假设胆固醇水平遵循正常分布。如果这20名患者是来自平均215人,标准偏差10人的随机抽样,平均胆固醇水平为257或以上的概率是多少?

湾解释为什么这20名患者实际上不是随机样本(来自健康的中年男性的人群)。

(Studenmund,练习1.6)你的朋友有一个校内工作,打电话给校友,要求你的大学的年度基金捐款,她想知道她的电话是否有所作为。为了衡量学生电话对筹款的影响,她收集了50个明矾的数据,并估计出以下等式:^ Gi = 2.39 + 0.001Ii + 4.62Ci其中Gi是2016年度基金捐款(美元),Ii是2016年估计收入(美元),Ci是2016年捐款的电话数量。

一个。仔细解释每个系数估计的含义。估计的迹象是你预期的吗?

湾为什么左手变量^ Gi而不是G?

这是一个错误吗?为什么或者为什么不?

天。

用你自己的话教育来定向错误项和定义残差。

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