问题 单项选择题

现已知因子A有3个水平,在实验中每一水平下进行了4次重复实验,并求得因子与误差平方和分别为SA=58.35,Se=46.85。在给定α=0.05的水平上因子A的显著性质为______。

A.显著的

B.不显著的

C.总是显著的

D.无法判断

答案

参考答案:A

解析:
由于因子A有3个水平,即r=3,所以fA=3-1=2,又在每一水平下进行了4次重复实验,即m=4,所以fe=3×(4-1)=9,现在SA=58.35,Se=46.85,则MSA=SA/fA=58.35/2=29.175。MSe=Se/fe=46.85/9=5.21,从而F=MSA/MSe=5.599对于给定的α=0.05,则1-α=0.95,从F分布表查得F0.95(2,9)=4.26。由F>4.26,所以在α=0.05水平上因子A是显著的。

阅读理解

阅读理解。

     In the world, soccer of football is the most popular sport. This is because many countries have wonderful

teams for the World Cup. The World Cup is held every four years.

     To remember 2002 FIFA World Cup,children from different countries and more than 60 children from

Japanese schools came together and spent three weekends drawing a big picture called "Dream (梦幻) World

Cups" in Japan.The children drew animals, flowers and people playing occer under a blue bright sky. They

wished each football team good luck by drawing the flags (旗帜) of all the countries that will take part in the

World Cup in Japan and South Korea. The picture was put up in a park near a playground in Yokohama. Some

football teams will have games there.

     Are you a football fan (迷)? The World Cup makes more and more people interested in football

Teenagers (青少年) like playing and training football. Many of them love some football stars so much that they

get the pictures of their favorite players on the walls of their rooms. That is the way to show their love for the

World Cup as children in Japan.

1. If a country wants to take part in the World Cup, she must have _____. [ ]

A. Many football fans  

B. a very good team

C. many football player  

D. a big playground

2. The next World Cup will be held in _______. [ ]

A. 2006

B. 2007

C. 2005 

D. 2004

3. From the passage, in the picture children drew many things except _______. [ ]

A. people playing football

B. pictures of some football stars

C. a sunny sky

D. flowers

4. In "Dream World Cup", the children drew the flags of some countries ______. [ ]

A. to show their love for their own country

B. to tell the people their stories

C. to show their good wishes for the football teams

D. to show their new ideas about football

5. Many teenagers own the pictures of some football stars because ______. [ ]

A. they are interested in football 

B. they are football fans

C. they think their favorite players are great 

D. all of A, B an

问答题