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问题 单项选择题

某研究选取容量均为5的三个独立样本，进行方差分析，其总自由度为( )。

A．15

B．12

C．2

D．14

答案

参考答案：D

解析：总自由度是3×5-1=14。组间自由度是2，组内自由度是12。

阅读理解

阅读短文，判断句子的正误。对的写“T”，错的写“F”。

Dear grandma,

     How are you? Thank you for the new shirt. It’s beautiful. I like it. Now I am writing (写) at the

new school. This is a nice school. The trees are green, the flowers are red and yellow. We have a

music room, an art room, a computer room, a canteen and a library. The playground is so big. We

can play football there.

     Oh, it’s time to go home now. Let me stop here. Welcome to my school and welcome to my home.

                                                                                                                                           yours,

                                                                                                                                           John

( ) 1. John is writing to his mother.

( ) 2. John has a new jacket.

( ) 3. John’s school is nice.

( ) 4. The playground is big.

( ) 5. They can play football on the playground.
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单项选择题

教育储蓄可以享受两大优惠政策：一是在国家规定对个人所得的教育储蓄存款利息所得，免除个人所得税（利息的20%），由此教育储蓄的实得利息收益率就比其他同档次储种高（）以上。

A.10%

B.15%

C.20%

D.25%
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