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單項(xiàng)選擇題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？（）

A.0.0896
B.0.2936
C.0.0413
D.0.0007

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1.單項(xiàng)選擇題A weighted average of the value of a random variable, where the probability function provides weights is known as（）

A.a probability function
B.a random variable
C.thee xpected value
D.random function

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2.單項(xiàng)選擇題A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is（）

A.0.4332
B.0.9332
C.0.0668
D.0.5668

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3.單項(xiàng)選擇題From a population of 500 elements，a sample of 225 elements is selected.It is known that the variance of the population is 900.The standard error of the mean is approximately（）

A.1.1022
B.2
C.30
D.1.4847

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4.單項(xiàng)選擇題Given the following information：Standar ddeviation=8 Coefficient of variation=64% The mean would then be（）

A.12.5
B.8
C.0.64
D.1.25

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5.問答題 同等劑量的藥品采用不同的服用方式往往取得不同的效果，方案A是在每日三餐后服用，方案B是每日僅僅服用一次相同總劑量的藥品。對(duì)病情相似的20-44歲的患者進(jìn)行隨機(jī)抽樣，測(cè)試所服藥品在消化道中的中轉(zhuǎn)時(shí)間，選擇服用方案的順序是隨機(jī)的。下表給出了12名患者分別按方案A和方案B服用后，藥品在消化道中的中轉(zhuǎn)時(shí)間。
在顯著性水平α＝0.05時(shí)能否認(rèn)為方案A和方案B在藥品中轉(zhuǎn)時(shí)間上存在差異？

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