Michael Bayley, Marketing Director of ...

单项选择题Michael Bayley, Marketing Director of UniPower’s Electrical Division, is leading a study to identify and assess the relative importance of product features. Michael directs his staff to design a survey questionnaire for distribution to all of UniPower’s 954 customers. For this study, the set of 954 customers is a （）.

A.statistic
B.population
C.parameter
D.sample

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1.单项选择题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 （）.

A.nonparametric statistics
B.nominal data
C.descriptive statistics
D.inferential statistics

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2.判断题Statistical independence means the outcome of one event is independent of the outcome of a second event.

参考答案：对

3.判断题If the population distribution is unknown, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size is at least 15 observations.

参考答案：错

4.判断题When analyzing categorical data, stem and leaf display is an appropriate plot.

参考答案：错

5.单项选择题X is a discrete random variable that can have values from 0 to infinity, and occurrences of the events X counts are independent. The standard deviation of X is equal to the square root of the mean. The probability distribution of X is a(n) （）distribution.

A.binomial
B.uniform
C.normal
D.Possion

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6.单项选择题The empirical rule tells us that approximately of the values cluster within a distance of 1 standard deviation from the mean for a bell-shaped distribution（）

A.68%
B.95%
C.99.7%
D.none of the above

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7.单项选择题The reason that we prefer the sample standard deviation as our measure of typical variation instead of the sample variance is that（）

A.the variance is not as accurate a measurement as the standard deviation
B.the standard deviation has been corrected for bias while the variance has not
C.the standard deviation is in the same units as the data values.
D.the variance is in the same units as the data values.

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8.单项选择题The sum of the deviations may be 0.00.To get around this problem，we use the（）of the deviations

A.square
B.absolute value
C.minimum
D.maximum

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9.单项选择题deviation is the distance between a（）and the（）.（）

A.median；mean
B.data point；mean
C.quartile；median
D.data point；median

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10.单项选择题A theorem that allows us to use thenormal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the（）

A.approximation theorem
B.normal probability theorem
C.central limit theorem
D.central normality theorem

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