A.直線趨勢模型
B.指數曲線趨勢模型
C.二次曲線趨勢模型
D.修正指數曲線趨勢模型
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A.算術平均法
B.幾何平均法
C.代數平均法
D.調和平均法
A.時點序列
B.時期序列
C.特征序列
D.平穩(wěn)序列
A.0.19
B.0.81
C.0.6561
D.0.9
A.直線趨勢
B.曲線趨勢
C.異方差
D.異常數據
使用最小二乘法估計得出的樣本回歸直線必然通過點()
A.(0,0)
B.(x,0)
C.(0,y)
D.(x,y)
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最新試題
什么是季節(jié)變動?研究它的意義何在?如何測定季節(jié)變動?
A cumulative frequency polygon is also called ().
時間序列構成因素有哪些?分解的基本原理和思路是什么?
Which of the following statements is not true?()
為什么在計算平均指標的基礎上還有必要進一步計算變異指標?
變量數列中,各組頻率之和應()
The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the approximate range of the number of phone calls arriving each hour?()
Descriptive statistics deals with methods of()
If the individual class frequency is divided by the total frequency, the result is the ().
Simon Arnett, Director of Human Resources, is exploring the causes of employee absenteeism at Buderim Bottling during the last operating year (1 January 2005 to 31 December 2005). Personnel records of 50 employees are selected for analysis. (The plant employs 250.) For this study, the average number days absent for these 50 employees is a ().