問答題某種纖維原有的平均強度不超過6克,現(xiàn)通過改進工藝來提高其平均強度。研究人員測得了100個關(guān)于新纖維的強度數(shù)據(jù),發(fā)現(xiàn)其均值為6.35。假定纖維強度的標準差仍保持為1.19不變,在5%的顯著性水平下對該問題進行假設(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

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()

題型:單項選擇題

要了解某地區(qū)全部大學(xué)生的就業(yè)情況,那么()

題型:多項選擇題

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()

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

常用的長期趨勢測定的方法有哪些?各有什么特點?

題型:問答題

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?

題型:問答題

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 ().

題型:單項選擇題

A cumulative frequency polygon is also called ().

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). 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

變量數(shù)列中,各組頻率之和應(yīng)()

題型:單項選擇題