商務統(tǒng)計學單項選擇題每日一練(2020.05.06)

來源：考試資料網(wǎng)

1 The student body of a large university consists of 60%female students.A random sample of 8 students is selected.What is the probability that among the students in the sample exactly two are female？（）

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2 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 （）.

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3 Penny Bauer, Chief Financial Officer of Harrison Haulage, suspects irregularities in the payroll system, and orders an inspection of ‘each and every payroll voucher issued since 1 January 2005’. Five per cent of the payroll vouchers contained material errors. This is an example of （）.

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4 如果y和x的樣本相關(guān)系數(shù)為0.81，則y對x的線性回歸模型的判定系數(shù)為（）

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5 在15版以前，一次只能打開一個的窗口是（）

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