Riemann surface
matlab

AP统计学考试准备：AP统计学考试的重点和要求，解题策略和技巧，模拟考试和练习题的解析等。

1.35 U. S. INCOMES The distribution of individual incomes in the United States is strongly skewed to the right. In 1997, the mean and median incomes of the top $1 \%$ of Americans were $\$ 330,000$and$\$675,000$. Which of these numbers is the mean and which is the median? Explain your reasoning.

Mean $=\$ 675,000 ;$median$=\$330,000$. The mean is nonresistant to the effects of the extremely high incomes in the right tail of the distribution. It will therefore be larger than the median.

1.38 Is the interquartile range a resistant measure of spread? Give an example of a small data set that supports your answer.

Yes, IQR is resistant.
Take the data set $1,2,3,4,5,6,7,8$ as an example. In this case the median $=4.5, \mathrm{Q} 1=2.5$, $\mathrm{Q} 3=6.5$, and $\mathrm{IQR}=4$. Changing any “extreme” value (that is, any value outside the interval between Q1 and Q3) will have no effect on the IQR. For example, if 8 is changed to 88, the IQR will still equal 4 .

E-mail: help-assignment@gmail.com  微信:shuxuejun

help-assignment™是一个服务全球中国留学生的专业代写公司