问题 单项选择题 A1/A2型题

反映一组正态分布计量资料离散趋势的指标是()

A.变异系数

B.标准误

C.标准差

D.均数

E.全距

答案

参考答案:C

解析:标准差是用来说明一组观察值之间的变异程度,即离散度,故其反映一组正态分布计量资料离散趋势。标准误是用来表示抽样误差的大小,均数是反映一组性质相同的观察值的平均水平或集中趋势的统计指标。标准差与平均数的比值称为变异系数。全距是一组数据变动范围大小的度量。故选C。

阅读理解

Looking back on the first twenty years of my life, I feel grateful to have been so healthy and happy. I’m happy due to many key factors(因素). They include my physical health,healthy finances and my family’s happiness.

Health comes first for me, because without health everything else is meaningless. Imagine starting a career without good health. Imagine achieving anything without good health.  小题1: 

Good health is not enough to be happy.   小题2:  Money obviously pays for the basic necessities of life----food, housing, clothing, etc. ---but it is also necessary for other reasons. Money guarantees we always get good medical treatment when we fall ill.   小题3:   

Family is another important factor in having a happy life because it provides the love ,joy, and support that everyone needs. I love my family with all my heart. I get pleasure from their pleasure. I suffer when they suffer. 小题4:  They give me advice when I have misunderstandings with my friends. More importantly, they are always there to share everything with me.

  小题5:   As long as I stay healthy, work hard to earn enough money and share both good times and bad times with my family, I will always be the happiest girl in the world.

A.We still need money in today’s society.

B.These three factors are all I need in this world.

C.Besides, we can use money to improve our life.

D.My family help me get through pressures and difficulties.E. Sometimes the amount of money we have is determined by out happiness.

F. Clearly, good health is much more important than any other aspect of one’s life.

G. Having good health and healthy finances, we can turn our attention to the happiness of our family.

单项选择题