单项选择题

A.sample based upon information contained in the popula……

The purpose of statistical inference is to provide information about the（）

A.sample based upon information contained in the population
B.population based upon information contained in the sample
C.population based upon information contained in the population
D.mean of the sample based upon the mean of the population

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单项选择题If A and B are independent events，then（）

A.P（A） must be equal to P（B）
B.P（A） must be greater thanP（B）
C.P（A） must be less than P（B）
D.P（A） must be equal to P（A│B）

单项选择题Exhibit 2 The following represents the probability distribution for the daily demand of computers at a local store. Refer to Exhibit 2.The probability of having a demand for at least two computers is（）

A.0.7
B.0.3
C.0.4
D.1.0

单项选择题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

单项选择题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

单项选择题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