問答題某種纖維原有的平均強(qiáng)度不超過6克,現(xiàn)通過改進(jìn)工藝來提高其平均強(qiáng)度。研究人員測得了100個關(guān)于新纖維的強(qiáng)度數(shù)據(jù),發(fā)現(xiàn)其均值為6.35。假定纖維強(qiáng)度的標(biāo)準(zhǔn)差仍保持為1.19不變,在5%的顯著性水平下對該問題進(jìn)行假設(shè)檢驗。選擇檢驗統(tǒng)計量并說明其抽樣分布是什么樣的?

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4.單項選擇題

一家電器銷售公司的管理人員認(rèn)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(jìn)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

最新試題

If the individual class frequency is divided by the total frequency, the result is the ().

題型:單項選擇題

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 ().

題型:單項選擇題

一個地區(qū)一定時期的商品零售額屬于()

題型:多項選擇題

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 ().

題型:單項選擇題

如果居民按報告期價格購買商品需多支出40萬元,報告期商品銷售額為200萬元,則價格指數(shù)為()

題型:單項選擇題

某企業(yè)2018年技術(shù)工占50%,2019年新招收了一批學(xué)徒工,使學(xué)徒工的比重增加了10%。假定全廠各級工資水平均無變化,則2019年職工總平均工資將()

題型:單項選擇題

One rule that must always be followed in constructing frequency distributions is that ().

題型:單項選擇題

為什么在計算平均指標(biāo)的基礎(chǔ)上還有必要進(jìn)一步計算變異指標(biāo)?

題型:問答題

The number of class intervals in a frequency distribution is usually between ().

題型:單項選擇題

變量數(shù)列中,各組頻率之和應(yīng)()

題型:單項選擇題