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一家電器銷售公司的管理人員認為,每月的銷售額是廣告費用的函數(shù),并想通過廣告費用對月銷售額作出估計。用電視廣告費用作自變量,銷售額作因變量進行回歸分析。下表給出了相關(guān)的分析結(jié)果:
下列說法正確的是()
A.廣告費用每增加$1,000, 銷售額增加$1.420 211
B.廣告費用每增加$1,000, 銷售額增加$1420. 211
C.廣告費用每增加$1420.211, 銷售額增加$1000
D.廣告費用每增加$1, 銷售額增加$363.689 1
某汽車生產(chǎn)商想要了解廣告費用 (X) 對銷售量 (Y) 的影響,收集了過去12年的有關(guān)數(shù)據(jù)。通過計算得到下面的ANOVA表,其中顯著水平α=0.05。
方差分析表中虛線所代表的數(shù)據(jù)分別為()
A.4015.807和399.1
B.4015.807和0.0025
C.0.9755和399.1
D.0.0244和0.0025
最新試題
某企業(yè)的生產(chǎn)計劃完成百分比采用如下分組,請指出哪項是正確的()
要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()
對某班級學(xué)生的生活狀況進行統(tǒng)計調(diào)查,下列標志中屬于不變標志的是()
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). The average number of absences per employee, calculated from the personnel data of all employees, is a ().
常用的長期趨勢測定的方法有哪些?各有什么特點?
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 student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of ().
A cumulative frequency polygon is also called ().
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 ().
變量數(shù)列中,各組頻率之和應(yīng)()