皮皮学，免费搜题
登录
搜题
【简答题】
5 根据美国 1961 年第一季度至 1997 年第二季度数据,我们得到了如下的咖啡需求函数的回归方程: 其中, Q 为人均咖啡消费量(单位:磅) P 为咖啡的价格(以 1967 年价格为不变价格) I 为人均可支配收入(单位:千元,以 1967 年价格为不变价格) 为茶的价格( 1/4 磅, 以 1967 年价格为不变价格 ) T 为时间趋势变量( 1967 年第一季度为 1 , ...... , 1977 年第二季度为 66 ) 请回答以下问题: (1) 模型中 P 、 I 和 的系数的经济含义是什么? (2) 咖啡的价格需求是否很有弹性? (3) 咖啡和茶是互补品还是替代品? (4) 你如何解释时间变量 T 的系数? (5) 你如何解释模型中虚拟变量的作用? (6) 哪一个虚拟变量在统计上是显著的? (7) 咖啡的需求是否存在季节效应?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【简答题】Most people like to keep a healthy diet during the holiday season starting from Thanksgiving to Christmas and New Year. There are many social 's to 1)_________ and we love to look our best. We al...
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
本草纲目
B.
神农本草经
C.
新修本草
D.
证类本草
查看完整题目与答案
【简答题】Listen to the passage and fill in the blanks with the exact words you hear. Most people like to keep a healthy 1) _____ during the holiday season starting from Thanksgiving to Christmas and New Year. ...
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
《本草纲目》
B.
《本草品汇精要》
C.
《证类本草》
D.
《本草经集注》
查看完整题目与答案
【单选题】听力原文： Before World War n, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents...
A.
He was first of all a scientist.
B.
He was not only a naturalist but also a scientist.
C.
He was no more than a born naturalist.
D.
He was a scientist as well as a naturalist.
查看完整题目与答案
【判断题】曲柄摇杆机构存在死点条件,一是摇杆为主动件,二是曲柄与连杆共线。
A.
正确
B.
错误
查看完整题目与答案
【判断题】耐力运动膳食脂肪应略低于其他项目,可占总能量 20 ~ 25% 。
A.
正确
B.
错误
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
本草拾遗
B.
本草纲目
C.
证类本草
D.
新修本草
E.
本草纲目拾遗
查看完整题目与答案
【单选题】为什么古建筑正堂左边摆花瓶、右边摆坐屏,有何说法?
A.
随意摆放无寓意
B.
为了装饰美观
C.
取的是瓶镜的谐音“平静”
D.
表示家中富贵多福
查看完整题目与答案
【单选题】听力原文： Before World War II, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparent...
A.
Because the family was extremely large.
B.
Because he didn't live very long with them.
C.
Because he was too young when he lived with them.
D.
Because he was fully occupied with observing nature.
查看完整题目与答案
相关题目：
【简答题】Most people like to keep a healthy diet during the holiday season starting from Thanksgiving to Christmas and New Year. There are many social 's to 1)_________ and we love to look our best. We al...
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
本草纲目
B.
神农本草经
C.
新修本草
D.
证类本草
查看完整题目与答案
【简答题】Listen to the passage and fill in the blanks with the exact words you hear. Most people like to keep a healthy 1) _____ during the holiday season starting from Thanksgiving to Christmas and New Year. ...
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
《本草纲目》
B.
《本草品汇精要》
C.
《证类本草》
D.
《本草经集注》
查看完整题目与答案
【单选题】听力原文： Before World War n, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents...
A.
He was first of all a scientist.
B.
He was not only a naturalist but also a scientist.
C.
He was no more than a born naturalist.
D.
He was a scientist as well as a naturalist.
查看完整题目与答案
【判断题】曲柄摇杆机构存在死点条件,一是摇杆为主动件,二是曲柄与连杆共线。
A.
正确
B.
错误
查看完整题目与答案
【判断题】耐力运动膳食脂肪应略低于其他项目,可占总能量 20 ~ 25% 。
A.
正确
B.
错误
查看完整题目与答案
【单选题】集我国16世纪以前药学大成的本草著作是
A.
本草拾遗
B.
本草纲目
C.
证类本草
D.
新修本草
E.
本草纲目拾遗
查看完整题目与答案
【单选题】为什么古建筑正堂左边摆花瓶、右边摆坐屏,有何说法?
A.
随意摆放无寓意
B.
为了装饰美观
C.
取的是瓶镜的谐音“平静”
D.
表示家中富贵多福
查看完整题目与答案
【单选题】听力原文： Before World War II, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparent...
A.
Because the family was extremely large.
B.
Because he didn't live very long with them.
C.
Because he was too young when he lived with them.
D.
Because he was fully occupied with observing nature.
查看完整题目与答案